Subjects -> ENGINEERING (Total: 2677 journals)
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CHEMICAL ENGINEERING (235 journals)                  1 2 | Last

Showing 1 - 200 of 235 Journals sorted alphabetically
ACS Applied Nano Materials     Hybrid Journal   (Followers: 11)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 9)
ACS Engineering Au     Open Access   (Followers: 8)
ACS Environmental Au     Open Access   (Followers: 11)
ACS ES&T Engineering     Hybrid Journal   (Followers: 1)
ACS ES&T Water     Hybrid Journal  
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 10)
Acta Chemica Malaysia     Open Access  
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 6)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Advanced Chemical Engineering Research     Open Access   (Followers: 52)
Advanced Membranes     Open Access   (Followers: 7)
Advanced Powder Technology     Hybrid Journal   (Followers: 15)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 4)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24)
Advances in Chemical Engineering and Science     Open Access   (Followers: 110)
Advances in Polymer Technology     Open Access   (Followers: 14)
Aerosol Science and Engineering     Hybrid Journal  
Aerosol Science and Technology     Hybrid Journal   (Followers: 13)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
All Life     Open Access  
American Journal of Polymer Science & Engineering     Open Access   (Followers: 2)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 12)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 11)
Applied Petrochemical Research     Open Access   (Followers: 2)
ASEAN Journal of Chemical Engineering     Open Access  
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 13)
Biofuel Research Journal     Open Access   (Followers: 1)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 3)
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
C&EN Global Enterprise     Full-text available via subscription  
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Carbon Capture Science & Technology     Open Access  
Case Studies in Chemical and Environmental Engineering     Open Access  
Catalysts     Open Access   (Followers: 11)
Chem Catalysis     Hybrid Journal  
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemEngineering     Open Access  
Chemica : Jurnal Teknik Kimia     Open Access  
Chemical and Engineering News     Free   (Followers: 22)
Chemical and Materials Engineering     Open Access   (Followers: 54)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 8)
Chemical and Process Engineering     Open Access   (Followers: 67)
Chemical and Process Engineering Research     Open Access   (Followers: 64)
Chemical Engineer, The     Partially Free  
Chemical Engineering & Technology     Hybrid Journal   (Followers: 28)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 15)
Chemical Engineering and Science     Open Access   (Followers: 58)
Chemical Engineering Communications     Hybrid Journal   (Followers: 14)
Chemical Engineering Education     Full-text available via subscription   (Followers: 2)
Chemical Engineering Journal     Hybrid Journal   (Followers: 71)
Chemical Engineering Journal Advances     Open Access   (Followers: 1)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Engineering Research Bulletin     Open Access   (Followers: 44)
Chemical Engineering Science     Hybrid Journal   (Followers: 28)
Chemical Geology     Hybrid Journal   (Followers: 31)
Chemical Papers     Hybrid Journal   (Followers: 4)
Chemical Reviews     Hybrid Journal   (Followers: 178)
Chemical Science International Journal     Open Access  
Chemical Society Reviews     Hybrid Journal   (Followers: 44)
Chemical Technology     Open Access   (Followers: 75)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 166)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chempublish Journal     Open Access  
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Cleaner Chemical Engineering     Open Access   (Followers: 8)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 12)
CORROSION     Full-text available via subscription   (Followers: 20)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 35)
Crystal Research and Technology     Hybrid Journal   (Followers: 7)
Current Opinion in Chemical Engineering     Open Access   (Followers: 5)
Current Research in Food Science     Open Access  
Designed Monomers and Polymers     Open Access   (Followers: 1)
Digital Chemical Engineering     Open Access  
Discover Chemical Engineering     Open Access  
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription   (Followers: 3)
EnergyChem     Hybrid Journal   (Followers: 1)
Equilibrium : Journal of Chemical Engineering     Open Access  
Eurasian Chemico-Technological Journal     Open Access  
European Polymer Journal     Hybrid Journal   (Followers: 42)
Fibers and Polymers     Full-text available via subscription   (Followers: 4)
Focusing on Modern Food Industry     Open Access   (Followers: 2)
Food and Environment Safety     Open Access   (Followers: 3)
Food Chemistry     Hybrid Journal   (Followers: 18)
Food Chemistry : Molecular Sciences     Open Access   (Followers: 1)
Food Chemistry : X     Open Access   (Followers: 1)
Food Frontiers     Open Access   (Followers: 1)
Frontiers in Chemical Engineering     Open Access  
Frontiers in Sensors     Open Access   (Followers: 6)
Frontiers in Sustainable Food Systems     Open Access   (Followers: 2)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 5)
Gases     Open Access   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal   (Followers: 1)
Graphene Technology     Hybrid Journal  
Green Chemical Engineering     Open Access  
High Performance Polymers     Hybrid Journal   (Followers: 1)
Indian Chemical Engineer     Hybrid Journal   (Followers: 4)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 9)
Indonesian Journal of Chemical Science     Open Access  
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 10)
Industrial & Engineering Chemistry Research     Hybrid Journal   (Followers: 20)
Industrial Gases     Open Access  
Info Chimie Magazine     Full-text available via subscription   (Followers: 1)
International Journal of Ceramic Engineering & Science     Open Access  
International Journal of Chemical Engineering     Open Access   (Followers: 7)
International Journal of Chemical Technology     Open Access   (Followers: 7)
International Journal of Chemistry and Technology     Open Access   (Followers: 1)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 3)
International Journal of Industrial Chemistry     Open Access  
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Waste Resources     Open Access   (Followers: 5)
International Research Journal of Pure and Applied Chemistry     Open Access  
Iranian Journal of Chemistry and Chemical Engineering (IJCCE)     Open Access   (Followers: 1)
Iranian Journal of Polymer Science and Technology     Open Access   (Followers: 1)
Journal of Advanced Manufacturing and Processing     Hybrid Journal  
Journal of Aerosol Science     Hybrid Journal   (Followers: 7)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 7)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 117)
Journal of Applied Science & Process Engineering     Open Access  
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Biopharmaceutics Sciences     Open Access   (Followers: 4)
Journal of Chemical & Engineering Data     Hybrid Journal   (Followers: 10)
Journal of Chemical and Petroleum Engineering     Open Access   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 4)
Journal of Chemical Engineering     Open Access   (Followers: 63)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 5)
Journal of Chemical Sciences     Partially Free   (Followers: 22)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 11)
Journal of Chemical Theory and Computation     Hybrid Journal   (Followers: 21)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 1)
Journal of Coating Science and Technology     Hybrid Journal  
Journal of Coatings     Open Access   (Followers: 3)
Journal of Engineered Fibers and Fabrics     Open Access  
Journal of Engineering & Processing Management     Open Access  
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 5)
Journal of Food Chemistry & Nanotechnology     Open Access   (Followers: 1)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access   (Followers: 1)
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 1)
Journal of Geochemical Exploration     Hybrid Journal   (Followers: 4)
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (Followers: 2)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Journal of Leather Science and Engineering     Open Access  
Journal of Materials Science and Chemical Engineering     Open Access   (Followers: 1)
Journal of Modern Chemistry & Chemical Technology     Open Access   (Followers: 2)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 7)
Journal of Non-Crystalline Solids : X     Open Access  
Journal of Organic Semiconductors     Open Access   (Followers: 6)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Research     Hybrid Journal   (Followers: 7)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Powder Technology     Open Access   (Followers: 4)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of the American Chemical Society     Hybrid Journal   (Followers: 328)
Journal of The Institution of Engineers (India) : Series E     Hybrid Journal   (Followers: 2)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 1)
Journal of the Turkish Chemical Society, Section B : Chemical Engineering     Open Access  
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 8)
Journal on Today's Ideas - Tomorrow's Technologies     Open Access   (Followers: 1)
JSFA reports     Full-text available via subscription   (Followers: 1)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Rekayasa Kimia & Lingkungan     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access  
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
Kvasný Průmysl     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Science for Energy Technologies     Open Access  
Materials Sciences and Applied Chemistry     Full-text available via subscription  
Modern Chemistry & Applications     Open Access   (Followers: 1)
Molecular Catalysis     Hybrid Journal   (Followers: 5)
Nanochemistry Research     Open Access   (Followers: 1)

        1 2 | Last

Similar Journals
Journal Cover
High Performance Polymers
Journal Prestige (SJR): 0.332
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0954-0083 - ISSN (Online) 1361-6412
Published by Sage Publications Homepage  [1174 journals]
  • Towards synchronously improving dielectric performances and thermal
           conductivity in Ni/PVDF by tailoring core-shell structured Ni@NiO
           particles

    • Free pre-print version: Loading...

      Authors: Weiwei Peng, Wenying Zhou, Guozheng Cao, Yating Yang, Jing Cao, Fanrong Kong, Guangheng Wang, Aihong Feng, Lidong Luo
      Abstract: High Performance Polymers, Ahead of Print.
      An insulating interlayer between conductive particles and polymer is crucial for preparing polymer dielectrics with high dielectric permittivity (ε) but low loss and high breakdown strength (Eb). To restrain the large loss of raw nickel (Ni)/poly (vinylidene fluoride) (PVDF) composites when still maintaining a high-ε at the percolation threshold (fc) of conductive fillers, in this work, nanoscale nickel oxide (NiO) shell with diverse thickness was coated around the surface of Ni particles via a facile thermal calcination at 650°C under air, and the gained Ni@NiO particles were composited with PVDF to produce morphology-controllable high-ε, low loss composites. The influences of the NiO shell and thickness on the dielectric performances and thermal conductivity (TC) of the composites were investigated in terms of filler loading and frequency. Compared with raw Ni/PVDF, the Ni@NiO/PVDF composites exhibit remarkably suppressed dielectric loss and enhanced Eb and TC because the NiO interlayer not only prevents the Ni particles from direct contact and hinders the long-range electron migration thereby resulting in rather low leakage current, but also simultaneously suppresses thermal interfacial resistance and enhances interfacial compatibility between the fillers and the matrix subsequently resulting in improved TC. Therefore, the Ni@NiO/PVDF with high ε-low loss, heightened Eb and TC present appealing potential applications in microelectronics and electrical industries.
      Citation: High Performance Polymers
      PubDate: 2022-07-01T04:44:42Z
      DOI: 10.1177/09540083221111320
       
  • Effect of layering angles on shape memory properties of graphene
           oxide/carbon fiber hybrid reinforced composites prepared by vacuum
           infiltration hot pressing system

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      Authors: Yi Xu, Yuqin Ma, Gangfeng Wang, Wei Xu, Tingting Zhao, Fei Li, Haiyin Guo
      Abstract: High Performance Polymers, Ahead of Print.
      Seven groups of different layering angles of Graphene oxide/Carbon fiber (GO-CF) hybrid reinforced shape memory composites are prepared by vacuum infiltration hot pressing system. The layering angles are respectively [0°]4, [±15°]s, [±30°]s, [±45°]s, [±60°]s, [±75°]s, and [90°]4. The shape fixation ratio, shape recovery ratio, and shape recovery driving force of GO-CF hybrid reinforced shape memory composites are investigated. The composite with the layering angle of [0°]4 has the minimum shape fixation ratio of 90.9%, the maximum shape recovery ratio of 97.6%, and the maximum recovery force of 2.83 N. Compared to [0°]4, the composite with the layering angle of [90°]4 has the 9.13% higher shape fixation ratio, but it has 16.1% lower shape recovery ratio and 59.4% lower recovery force. The microstructure of the composites is characterized and the microstructure of seven groups of composites is satisfactory. Therefore, the matrix within each group of composites has a similar effect on the shape memory properties of the composites. With the layering angle increased, the fiber resilience in the axial direction (X-direction) and the accumulated internal stress gradually decrease. With the layering angle increased, the shape fixation ratio and recovery time of GO-CF hybrid reinforced shape memory composites increase, while the shape recovery ratio, recovery force, and recovery rate decrease.
      Citation: High Performance Polymers
      PubDate: 2022-06-30T05:22:09Z
      DOI: 10.1177/09540083221111330
       
  • The effects of solvents on the physical and electrochemical properties of
           potassium-ion conducting polymer gel electrolytes

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      Authors: Vaishali Madhani, Mahendra Singh Rathore, Deepak Kumar
      Abstract: High Performance Polymers, Ahead of Print.
      The aim of present work is to investigate the effect of different solvent mixed within poly (vinylidiene fluoride-hexafluoropropylene) (PVDF-HFP) based Potassium ion conducting polymer gel electrolytes. The samples are prepared using solution casting method and the comparative behavior of adding carbonate and glyme in PVDF-HFP/KClO4 matrix is investigated. Subsequently, polymer gel electrolytes are characterized using X-ray diffractometer to analyze the structural features of the electrolyte films. The XRD results reveal that the prepared electrolyte films using both solvents demonstrate semi-crystalline nature. The surface morphology is studied using scanning electron microscopy and significant changes in surface morphology of the polymer gel electrolyte films is observed on introducing carbonate and glyme solvents. Thermal properties and effects of temperature on the prepared electrolytes is examined using differential scanning calorimetry and investigations reveal significant effect of temperature on the heat flow into the polymer gel electrolytes samples. The weight loss of the electrolyte samples with temperature is studied using Thermogravimetric analysis and it is observed that carbonate and glyme based electrolyte offer weight loss of about 7–8 %. The ionic conductivity of 2.53×10−7 Scm−1 and 3.67×10−4 Scm−1 while electrochemical stability window of ∼2.5 V is obtained for both polymer gel electrolytes with carbonate and glyme based solvents. The reversibility of K-ion has been established using cyclic voltammetry measurements.
      Citation: High Performance Polymers
      PubDate: 2022-06-28T10:42:47Z
      DOI: 10.1177/09540083221112310
       
  • Evaluation of aluminum to composite bonded lap joints

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      Authors: VenkataRamanaiah Darla, B Satish Ben, KV Sai Srinadh, K. Venkata Rao
      Abstract: High Performance Polymers, Ahead of Print.
      Adhesive bond is one of the best suitable joining technique for fiber reinforced polymer (FRP) composite structures used in aerospace applications. The weight of the composite structure greatly reduces by using structural adhesives for the joining processes. The surface preparation plays a major role for achieving the better bond strength. The present work deals with the validation of the bond strength of single lap joint(SLJ) with dissimilar adherends. The Al adherend has been considered for the surface treatments such as sand paper, NaOH and Resin pre-coating (RPC) for SLJs. The angle of contacts for the different surface treated specimens has been measured using the Young–Laplace method. X-Ray radiography and ultrasonic testing has been carried to verify the internal defects of bonded joint. The bonding strength was evaluated using a tensile and flexural test rig in polymer UTM. The bond strength of the RPC surface treated bonded joints showed better performance in terms of peak load and shear strength. The maximum shear strength has been increased up to 154.63 percentage when compared to untreated surface specimens, similar trend was observed in flexural strength. A numerical simulation model has been developed for validating the results. The comprehensive analysis for the de-bonded joints at maximum loading conditions has been done with morphological studies.
      Citation: High Performance Polymers
      PubDate: 2022-06-28T07:14:32Z
      DOI: 10.1177/09540083221111443
       
  • Preparation and gas separation performance of polyimide membranes
           endcapped with ionic liquid-type structures

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      Authors: Hongge Jia, Shijun Zhao, Pengfei Jiang, Boyu Jing, Guoxing Yang, Shuangping Xu, Mingyu Zhang, Yanqing Qu, Yonglan Zou
      Abstract: High Performance Polymers, Ahead of Print.
      A set of ionic liquid capped polyimide membranes was prepared using 1-aminoethyl-3-methylimidazolium hexafluorophosphate (IL1) and 1-aminopropylimidazolium bis(trifluoromethylsulfonyl)imine (IL2) as the terminal groups. The products’ molecular weights, mechanical properties, and separation permeability (CO2/CH4) were investigated. For CO2/CH4 separation, the selectivity of the ionic liquid capped polyimide membranes was higher than that of noncapped ones. Among them, the membrane synthesized by 4.4′- diaminodiphenyl ether and 4.4′-(hexafluoroisopropyl) diphthalic anhydride (6FDA) as monomer, with IL1 as terminal group, displayed the best selectivity. Its permeability was 7.47 Barrer and selectivity 102.42, which exceeded the 1991 Robeson curve. Polyimide membranes capped by ionic liquid showed high gas selectivity and good gas permeability as well as good physical and chemical properties. Consequently, it can be concluded that introducing an ionic liquid structure to polyimide chains could make attractive membrane materials for various gas separation and related applications.
      Citation: High Performance Polymers
      PubDate: 2022-06-22T10:23:17Z
      DOI: 10.1177/09540083221109867
       
  • Polyethylene-oxide: NaI polymer electrolyte: Electrical, structural and
           photoelectrochemical studies- RAFM

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      Authors: Abhimanyu Singh, Bhawna Joshi, Sangeeta Rawal, Pramod K Singh, Subhrajit Konwar, Aysh Y Madkhli, I.M Noor, Daksh Aggarwal, Diksha Singh, Summayya Saleh Ibrahim
      Abstract: High Performance Polymers, Ahead of Print.
      Conducting siodide doped polyethylene oxide freestanding electrolyte films are prepared by solution cast technique. Electrical, Structural, and device performances are given in detail. Maximum conducting polymer electrolyte has been used to develop electric double-layer capacitors as well as the dye-sensitized solar cell which shows that ion-conducting polymer electrolyte is a novel candidate for energy devices.
      Citation: High Performance Polymers
      PubDate: 2022-06-22T09:47:18Z
      DOI: 10.1177/09540083221108115
       
  • Hydrophilicity and flux properties improvement of high performance
           

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      Authors: Reyhan O Tasci, Mehmet A Kaya, Mithat Celebi
      Abstract: High Performance Polymers, Ahead of Print.
      To achieve increased flow and reduce fouling, polymeric membranes can be functionalized with hydrophilic groups such as sulfone, amines, and others. This research has aimed at the sulfonation of Polysulfone (PSU) with various agents and at varying substitution degrees to change its hydrophobic character. PSU was also blended with Poly(lactic acid) (PLA), which is a more hydrophilic polymer. The phase inversion method was used to make PSU, PLA, sulfonated PSU, and PSU/PLA blend-based membranes. Sulfonation degrees of sulfonated PSU membranes were assessed using FT-IR, mechanical characteristics of membranes were determined, and thermal properties of membranes were clarified using DSC and TGA techniques. Hydrophilic natures and membrane alterations were investigated, as well as contact angle and water uptake measures. Among three distinct sulfonation agents (trimethylsilyl chlorosulfonate (TMSCS), sulfuric acid, and chlorosulfonic acid) employed to produce a 20% sulfonation degree of polysulfone, TMSCS was chosen as having the highest sulfonation efficiency (91.5%). With increasing sulfonation degree, a drop in molecular weight was seen in all sulfonated polysulfone samples. The mechanical strength values of polysulfone after sulfonation with TMSCS rose from 35.23 MPa to 63.35 MPa, while the contact angle value decreased from 85.58° to 71°. The contact angle value reduced from 85.58° to 64.68° while the mechanical strength of the PSU and PSU/PLA (50:50) blend increased from 35.23 MPa to 39.3 MPa. Membranes were also tested for pure water flux, hydrostability, and biostability. In terms of application requirements, it was determined that sulfonated PSU-based membranes manufactured with TMSCS with a 20% sulfonation degree and PSU/PLA blend-based membranes with a 50:50 (w:w) ratio have the optimum compositions with high flux quantities.
      Citation: High Performance Polymers
      PubDate: 2022-06-18T03:31:01Z
      DOI: 10.1177/09540083221110031
       
  • Preparation and performance of acrylic acid grafted PES ultrafiltration
           membrane via plasma surface activation

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      Authors: Peng Zhang, Ru Li
      Abstract: High Performance Polymers, Ahead of Print.
      A modified PES ultrafiltration membrane with excellent separation and antifouling properties was obtained after modification by remote Ar–NH3 plasma-induced acrylic acid (AA) grafting. Hydrophilic properties were characterised using water contact angle measurements. The morphology was analysed using SEM and BET measurements. Changes in the surface functional groups were determined using XPS and ATR-FTIR. The separation and antifouling properties were evaluated through a bovine serum albumin (BSA) separation experiment. The results revealed that the surface structure of the modified membrane was not destroyed, that amino groups were introduced on the surface of the PES membrane, and that AA was successfully grafted. The water contact angle decreased from 67° in the original membrane to 5 ± 0.63° in the modified membrane. The water flux increased from 30 to 93.6 L/(m2·h). The rejection rate of BSA increased from 61.5 to 93.8%, and the flux recovery rate increased from 60.0 to 92.3%.
      Citation: High Performance Polymers
      PubDate: 2022-06-16T08:46:36Z
      DOI: 10.1177/09540083221104391
       
  • Optimizing the structural properties of electrospun polyimide membranes by
           response surface method

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      Authors: Solmaz Parsaei, Seyed Mojtaba Zebarjad, Mohammad Hadi Moghim
      Abstract: High Performance Polymers, Ahead of Print.
      Recently, there has been a rising tendency for the fabrication of membranes using the electrospinning method because it can control the properties of the fibrous mats by changing the parameters of the process. For this reason, in the current research, polyimide (PI) membranes were fabricated by the electrospinning method. The effect of electrospinning parameters on the content of porosity and tensile properties of the electrospun PI mats were investigated. Solution concentration, device voltage, and feed rate were considered the process parameters. Response surface methodology was adopted to design the electrospinning experiments. The results showed that the feed rate had the most contribution to the content of porosity of electrospun PI membranes which increased by decreasing the feed rate. On the other hand, the polymer concentration had a remarkable effect on the tensile strength. Indeed, the tensile strength improved as the solution concentration increased. The optimized electrospinning parameters to achieve both the highest porosity (97.66%) and the highest tensile strength (2.25 MPa) in the PI membrane were as follows: solution concentration 16.78%wt, device voltage 17 kV, and feed rate 1.4 mL h−1. The experimental results were in good agreement with the predicted values.
      Citation: High Performance Polymers
      PubDate: 2022-06-10T02:11:36Z
      DOI: 10.1177/09540083221107823
       
  • Synthesis of quaternary copolymerized fluorine-containing polyimides with
           good thermal properties and low dielectric constant

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      Authors: Lu Zhao, Xiangjun Ma, Qilong Huang, Chonghao Lu, Xianwu Cao
      Abstract: High Performance Polymers, Ahead of Print.
      Novel fluorine-containing polyimides were synthesized through copolymerization by using 2,3,3′,4′-biphenyltetracarboxylic dianhydride (α-BPDA) and 4,4′-(4,4′-isopropydenediphenox-y) bis-(phthalic anhydride) (BPADA) as dianhydrides and 4,4′-oxydianiline (ODA) and 2,2 - Bis [4-(4-aminophenoxy)phenyl]-hexafluoropropanane (HFBAPP) as diamines. Noncoplanar structure, flexible ether bond, and trifluoromethyl give the polyimide good thermoplastic, solubility, and heat resistance. The glass transition temperatures of polyimide films are 232.5°C∼262.2°C, the 5% weight loss temperatures are 521.5°C∼531.0°C, and the residual mass is more than 50% as heating to 800°C. With the increase of HFBAPP content in diamine, the dielectric constant of the material decreases from 3.21 to 2.78, and the dielectric loss decreases from 0.00962 to 0.00687 at 1 MHz, which greatly improves the dielectric properties of the material.
      Citation: High Performance Polymers
      PubDate: 2022-06-06T09:59:06Z
      DOI: 10.1177/09540083221094963
       
  • Recent advances in thermally conductive polymer composites

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      Authors: Shuaiqiang Yu, Miaoming Huang, Rui Hao, Suqin He, Hao Liu, Wentao Liu, Chengshen Zhu
      Abstract: High Performance Polymers, Ahead of Print.
      Polymer matrix composites (PMCs) with high thermal conductivity (TC) play an important role in improving the heat dissipation capacity of a new generation of electronic devices, particularly for 5G and aviation applications. Over the last few decades, considerable efforts have been made in the fabrication of highly thermally conductive PMCs. Advances in the thermal conduction mechanism of polymer composites are induced to, and then commonly used thermally conductive fillers are presented. In the following, the factors affecting the TC of polymer composites are discussed in detail, including fillers, interfaces, polymer matrices and processing technologies. Special attention is paid to the thermally conductive fillers. Then, some application areas of thermally conductive polymer composites are introduced. Finally, the deficiencies and future development trends in this research field are put forward. It is expected that this review will provide some beneficial inspiration in improving the TC of PMCs.
      Citation: High Performance Polymers
      PubDate: 2022-06-06T06:16:33Z
      DOI: 10.1177/09540083221106058
       
  • Polymer composites based Epoxy-WB and WB2:Gamma-rays impact on structure,
           thermal degradation, and mechanical behavior

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      Authors: Mohamadou Al Hassan, Abdul Qadeer Dayo, Abdeldjalil Zegaoui, Mehdi Derradji, Ayouba Moussa Hassane, Wen-bin Liu, Jun Wang, Yu-guang Liu
      Abstract: High Performance Polymers, Ahead of Print.
      High performance polymer composites are essential materials in nuclear applications where many components can receive high ionizing rays doses such as gamma-rays. In this work, two composites named E51WB and E51WB2 based on epoxy (E51) and tungsten borides (WB and WB2) were manufactured at room temperature and then exposed to gammarays doses up to 2000 KGy. The goal of this study was to investigate and compare the impact of gamma-rays on the chemical structure, mechanical and thermal properties of E51WB and E51WB2 composites using FTIR, SEM, TGA and tensile tests. As the results, the char yield (Yc) for E51WB gradually increased from 40 to 46% at 0, 1000 and 1500 KGy, then slightly drop to 44% at 2000 KGy. The E51WB sample displayed the strain value of 2.3% at 0 KGy, and it increased to 4.7 and 5 % at 1000 and 1500 KGy, respectively, while at 2000 KGy it decreased to 3.5%. This may be due to phenomena such as hydrogen abstraction, disproportion, degradation or the formation of new bonds. The comparison of the TGA results of E51WB and E51WB2 at 1000 and 1500 KGy respectively, leads to the conclusion that E51WB2 is thermally more resistant. In addition, by comparing the tensile strength of these two samples at the same irradiation doses, it can be stated that the E51WB2 composite is stronger than its counterpart E51WB.
      Citation: High Performance Polymers
      PubDate: 2022-06-03T03:25:32Z
      DOI: 10.1177/09540083221105259
       
  • Regulating the electrical resistive switching behaviors of polyimides
           through different steric hindrance substituents on 2,7-position of
           tetraphenyl fluorene diamines moieties

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      Authors: Junyi Nan, Yingtao Fan, Kaitai Hu, Yang Gao, Fangyuan Chen, Yingzhong Shen, Yanhua Yang
      Abstract: High Performance Polymers, Ahead of Print.
      Three novel polyimides (PI(TPF-Br BPDA), PI(TPF-Ph BPDA), and PI(TPF-Ph-OMe BPDA)) with tetraphenyl fluorene (TPF) were synthesized and tested. The laboratorial results showed that the constructed electronic devices exhibited different memory behaviors due to the different steric hindrance substituents (bromine atom, phenyl, and 3,5-dimethoxyphenyl) in 2,7-position of TPF molecule. The memorizers based on PI(TPF-Br BPDA) and PI(TPF-Ph BPDA) presented volatile dynamic random access memory (DRAM) feature with turn-on voltages of −2.39 and +1.45 V, as same as −1.71 and +1.74 V, separately. However, the PI(TPF-Ph-OMe BPDA) based apparatus exhibited non-volatile write-once read-many-times memory (WORM) behavior with turn-on voltage of −1.13 V, due to the more charge traps of 3,5-dimethoxyphenyl moieties and higher dipole moment. The switching mechanism was verified by quantum simulation of energy level, electrostatic potential (ESP) surface and dipole moment. These results indicated that the electrical memory performance of the synthesized TPF-based PIs could be adjusted by modifying the electron donor structure.
      Citation: High Performance Polymers
      PubDate: 2022-06-03T02:33:43Z
      DOI: 10.1177/09540083221090670
       
  • Investigation of thermal, antibacterial and heavy metal ion removal
           behavior of polyamide/polyimide iron oxide nanocomposites

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      Authors: S. Mojtaba Amininasab, Reza Rezapour, Parisa Mohammadi, Diyari Khaki, Hossein Mighani
      Abstract: High Performance Polymers, Ahead of Print.
      In this study, a newly-designed diamine (DA) containing pyridine and carbazole groups was synthesized and the relevant polyamides (PAs) and polyimides (PIs) were prepared by polymerization reaction between the DA monomer and terephthalic acid, adipic acid, and pyromellitic dianhydride. In addition, polymer nanocomposites were prepared through a combination of the synthesized polymers with modified magnetite iron oxide nanoparticles. The synthesized compounds were fully characterized by hydrogen nuclear magnetic resonance (1HNMR), fourier-transform infrared (FTIR), field emitting scanning electron microscopy (FESEM), energy dispersive X-Ray (EDX), Transmission electron microscopy (TEM), Differential scanning calorimetry (DSC) and Thermogravimetric analysis (TGA) analyses. All of the synthesized properties of compounds such as thermal stability, viscosity, elimination capability of heavy metals ions adsorption, and antibacterial activity were investigated. Polyamides and PI showed good solubility in aprotic solvents and the viscosity was in the range of 0.72–0.89 dL/g. Also, the glass-transition temperature (Tg) of synthetic polymers was in the range of 214–273°C and 10% weight loss temperatures (T10%) for the synthesized compounds were in the temperature range of 280–492°C in N2, and the percentage of residual ash between 61 and 74%. The adsorption rate of Hg2+, Co2+, Pb2+, Cr2+, and Cd2+ metal ions by PA containing terephthalic acid (PAT) and its nanocomposite (NCPAT) showed that nanocomposite has a better performance compared to PAT. The highest and lowest removal efficiency was related to Hg2+ and Pb2+ ion, respectively. Finally, antibacterial test results against Gram-positive and Gram-negative bacteria showed favorable inhibitory effects of all the synthesized polymers.
      Citation: High Performance Polymers
      PubDate: 2022-06-01T03:03:00Z
      DOI: 10.1177/09540083221106053
       
  • Significantly enhanced thermally conductive epoxy composite composed of
           caterpillar-like structured expanded graphite/ boron nitride nanotubes

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      Authors: Menghan Zhu, Chao Xiao, Qiqi Qu, Yunsheng Da, Yanyan Liu, Xingyou Tian, Hua Wang
      Abstract: High Performance Polymers, Ahead of Print.
      The trend toward miniaturization, integration and multifunctionality of modern electronics has led to a rapid increase in power density, which makes heat dissipation a critical issue. Despite the great potential of graphite-related nanocomposites in dissipating excess heat to ensure high efficiency and long lifetime of electronic devices, the practical application of these composites is limited by the ultra-low vertical thermal conductivity due to the interfacial thermal resistance between graphite layers. Here, a caterpillar-like hybrid filler was fabricated by the in situ intercalation of boron nitride nanotubes (BNNTs) between expanded graphite (EG) layers based on chemical vapor deposition technology. Owing to the optimized interfacial thermal resistance by forming covalent C-N bonding at the interface of EG and BNNT, the through-plane thermal conductivity of epoxy-based nanocomposites can be up to 5.18 Wm−1 K−1. In addition, the composite possessed electromagnetic interference shielding performance of 33.34 dB while maintaining electrical insulation due to the hierarchical structure. This work provided a new strategy for fabricating polymer-based composites with excellent through-plane thermal conductivity in thermal management applications.
      Citation: High Performance Polymers
      PubDate: 2022-05-31T09:49:10Z
      DOI: 10.1177/09540083221106057
       
  • Insights into the luminescent properties of poly(phenylene
           sulfide)–grafted metal–organic framework (Tb–MOF–PPS) via
           copolymerization

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      Authors: Wanli Tang, Pengcheng Li, Dawei Yan, Yonggang Yan, Haohao Ren, Bo Wang, Jingxian Zhao
      Abstract: High Performance Polymers, Ahead of Print.
      In this study, a novel poly(phenylene sulfide)-grafted metal-organic framework (Tb–MOF–PPS) was fabricated. Initially, 2,5-dichloroterephthalic acid and TbCl3·6H2O were used as raw materials to synthesize the dihalogenated MOF (Tb–MOF) through ultrasound irradiation and hydrothermal methods. Subsequently, Tb–MOF was added at different mole proportions (2.5, 5, 7.5, and 10%) for the copolymerization of PPS, and a serial of Tb–MOF–PPS composites were successfully obtained. Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy proved that the Tb–MOF was covalently connected to PPS. The introduction of the Tb–MOF had no evident influence on the thermal properties of the composites. Additionally, the fluorescence characteristics revealed that the fluorescence excitation and emission spectra of the composites had a large redshift compared with that of PPS and possessed visible-light photoluminescence properties. These results indicate that the composites obtained can be used as optical sensors.
      Citation: High Performance Polymers
      PubDate: 2022-05-30T12:22:47Z
      DOI: 10.1177/09540083221105253
       
  • A novel proton exchange membrane derived from trisulfonated poly(arylene
           ether phosphine oxide) containing diphenyl ether moieties

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      Authors: Songli Mao, Yajie Wang, Liqin Kang, Huiying Liao, Huiping Liu
      Abstract: High Performance Polymers, Ahead of Print.
      A series of novel trisulfonated phosphine oxide polymers (tsPEPO-x) with different sulfonation degrees were prepared by intermolecular polymerization of trisulfonated phosphine monomer and 4,4′-dihydroxydiphenyl ether. The properties of these membranes were investigated in detail. The results showed that these membranes, especially those with high sulfonation degree, exhibited excellent overall performance. For example, the conductivity of tsPEPO-120 membrane reaches 0.093 S cm−1 at 80°C, which is higher than that (0.087 S cm−1) of Nafion 117. At the same time, the swelling rate is almost equivalent to that (20%) of Nafion 117. Moreover, the membrane also has good oxidation resistance in Fenton’s reagent. The obtained polymers showed good properties. The trisulfonated moieties and diphenyl ether simultaneously played important roles in improving the properties of the polymer.
      Citation: High Performance Polymers
      PubDate: 2022-05-20T09:55:06Z
      DOI: 10.1177/09540083221098618
       
  • Fabrication and mechanical, electrical properties study of polyimide films
           curing at low-temperature condition assisted by microwave

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      Authors: Kangkang Tao, Fei Qin, Yahui Li, Shuai Zhang, Shihui Han, Guangmin Liu, Jun Wang, Jun Shen, Zailin Yang, Yi Tang, Gaohui Sun
      Abstract: High Performance Polymers, Ahead of Print.
      Polyimide (PI) films with excellent mechanical and electrical properties were produced at a low temperature assisted by microwave. Depending on the reciprocating movement of dipole molecules excited by microwave, even though under a low temperature, the rotation and conformational changes of functional groups could also be promoted. Thus, reaction between N-H bond and -OH in carboxyl which could realize dehydration and cyclization of polyamic acid proceeded normally. Results revealed that the combination between ambient temperature only at 70°C and microwave power at 2000 W or higher could also produce PI films with imidization degree of 100%. For PI-2000W, compared with traditional PI film (PI-300°C) that generated only at temperature of 300°C, even though on the basis of no any change in molecular structure and addition of filler, the tensile strength, elastic modulus, crystallinity, and apparent density increased by about 21%, 51%, 37%, and 5%, respectively. For electrical properties, conductivity enhanced by one to two orders of magnitude comparing with PI-300°C. Results indicated that while keeping the original molecular structure of PI films unchanged, this work provided a new and effective method to assist the enhancement in mechanical and electrical properties of PI films.
      Citation: High Performance Polymers
      PubDate: 2022-05-20T07:39:32Z
      DOI: 10.1177/09540083221100366
       
  • Impact of charge carrier transport properties on conductivity-temperature
           dependence of gellan gum-LiCF3SO3 biopolymer electrolyte

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      Authors: N.A Abdul Aziz, E.Z.M Tarmizi, C.S.C Razak, I.M Noor
      Abstract: High Performance Polymers, Ahead of Print.
      Charge carrier density, mobility and diffusivity are three important transport properties in determining the ionic conductivity as well as the performance of solid polymer electrolyte. In this work, biopolymer electrolytes samples were prepared using the solution casting method by complexing gellan gum with different concentrations of lithium trifluoromethanesulfonate (3–15 wt.%). The values of charge carrier concentration, mobility, and diffusivity for electrolyte samples were estimated by fitting the Nyquist plot with an equation developed based on electrical impedance spectroscopy. At room temperature, the optimum electrolyte conductivity is 1.29×10−8 Scm−1 at 6 wt.% salt concentration. This result was supported by the highest percentage of free ions, 31.45%, observed in the FTIR method. As the temperature increases, the ionic conductivity increases to the optimum value before dropping. The highest conductivity of each sample was obtained at different temperatures (80°C–90°C) using the impedance method, whereas the percentage area of free ions was highest at 80°C for all samples with FTIR analysis. Overall, the ionic conductivity of this system has been dominated by the carrier charge density. Results suggest that, under these experimental conditions, electrical impedance spectroscopy is suitable for evaluating the charge transport properties at low temperatures.
      Citation: High Performance Polymers
      PubDate: 2022-05-17T07:00:48Z
      DOI: 10.1177/09540083221102743
       
  • High performance green composite from vanillin-based benzoxazine
           containing phthalonitrile and silane surface modified basalt fibers

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      Authors: Mehdi Derradji, Oussama Mehelli, Karim Khiari, Slimane Abdous, Sarah Soudjrari, Abdeldjalil Zegaoui, Noureddine Ramdani, Wenbin Liu, Mohamadou Al Hassan
      Abstract: High Performance Polymers, Ahead of Print.
      Benzoxazine containing phthalonitrile, as one of the most advanced high performance thermosetting resin, has gained a lot of attention in the last decades. Indeed, the combination of the thermally activated ring-opening polymerization of the benzoxazine and the cyano addition reaction of the phthalonitrile allows the development of robust polymeric networks. Following this path, a renewable natural resource, vanillin, was used to develop a new benzoxazine containing phthalonitrile thermosetting system. The newly developed monomers present the advantage of a simple synthesis process along with an autocatalytic polymerization mechanism. The molecular structures of the synthesized monomers were characterized by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (1H NMR). The curing behavior was assessed by differential scanning calorimetry (DSC). The newly developed monomers were then reinforced with a silane surface modified basalt fibers (BFs) allowing the preparation of a high performance green composite. The silane surface modification of the BFs was confirmed by FTIR and thermogravimetric analysis (TGA). The tensile and bending tests highlighted the remarkable mechanical properties of the developed green composite. Finally, the scanning electron microscopy (SEM) was used to study the mechanism of stress transfer between the matrix and the fillers. Overall, the developed green composite can be seen as a promising substitute to composites made from glass fibers.
      Citation: High Performance Polymers
      PubDate: 2022-05-17T06:29:50Z
      DOI: 10.1177/09540083221103762
       
  • Structural, thermal, and electrochemical studies of biodegradable gel
           polymer electrolyte for electric double layer capacitor

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      Authors: Sujeet K Chaurasia, Atul K. Sharma, Pramod K. Singh, Li Lu, Jiangfeng Ni, Serguei V Savilov, Alexey Kuznetsov, Anji R. Polu, Abhijeet Singh, Manoj K. Singh
      Abstract: High Performance Polymers, Ahead of Print.
      A quasi-solid-state supercapacitor is fabricated using a biodegradable gel polymer electrolyte (GPE), and graphene nano-platelets (GNPs) capacitive electrodes. The GPE film comprises biodegradable polymer cellulose acetate (CA), ionic liquid, 1-ethyl-3-methylimidazolium thiocyanate (EMImSCN) and dopant salt potassium thiocyanate (KSCN). The polymeric gel films are prepared using the standard “solution cast technique” and characterized by using X-ray diffraction (XRD), Differential scanning calorimetry (DSC), Thermogravemetric analysis (TGA), Impedance spectroscopy, and Linear sweep voltammetry techniques. The synthesized GPE exhibits maximum room temperature ionic conductivity ∼1.2 x 10−3 S cm−1 and an electrochemical stability window of ∼2.4 V. The electrical double layer capacitor (EDLC) is configured by sandwiching the GPE film between two graphene nanoplatelets (GNPs) electrodes. The performance of the EDLC cell is evaluated in terms of specific capacitance, rate, and pulse power by using cyclic voltammetry, and electrochemical impedance measurement techniques.
      Citation: High Performance Polymers
      PubDate: 2022-05-16T06:18:34Z
      DOI: 10.1177/09540083221101757
       
  • High specific surface area triphenylamine-based covalent organic
           framework/polyaniline nanocomposites for supercapacitor application

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      Authors: Shanxin Xiong, Zhuolong Li, Xiaoqin Wang, Ming Gong, Jia Chu, Runlan Zhang, Bohua Wu, Chenxu Wang, Zhen Li
      Abstract: High Performance Polymers, Ahead of Print.
      Covalent organic frameworks (COFs) possess extraordinary porosity, structural diversity, and good electrochemical performance, and have broad application prospects in the field of energy storage. However, the low conductivity of COFs limits its further development. In this paper, the electrochemical performance of triphenylamine-based COFs (TPA-COFs) was improved by compounding with highly conductive polyaniline (PANI) using solvothermal synthesis process. The highly conductive polyaniline fibers can act as conductive path in the composite to accelerate the charge transfer rate of TPA-COFs. The π-π interaction between TPA-COFs and PANI effectively decreases the agglomeration degree of PANI. The good dispersion of composite results in that the specific surface area of TPA-COFs/PANI-20 is high as 1233.9 m2 g−1, which provides rich diffusion channels for electrolyte ions. Moreover, the strong π-π structure in the composites ensures the stability of the material skeleton. Thus, TPA-COFs/PANI composite exhibits excellent rate characteristics and cycling stability.
      Citation: High Performance Polymers
      PubDate: 2022-05-16T01:19:43Z
      DOI: 10.1177/09540083221101288
       
  • Mechanical properties of polymer matrix/glass fiber composites containing
           metal/hybrid nanoparticles-an overview

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      Authors: Aiswarya Chrispin Laila, Mythili Narayanan, Devika Bhadrakumar Sindhu, Anju AlbyRoy
      Abstract: High Performance Polymers, Ahead of Print.
      Glass fiber reinforced composite has gained attention from various engineering fields because of its enhanced properties. This paper reviewed the mechanical characteristics, such as tensile strength, flexural strength, hardness number, impact strength, wear percentage, etc., of the composites from different experimental studies performed by various researchers over time; by varying with the weight percentage of different metal and non-metal nanoparticles. The main observation was that the mechanical properties remained optimal at a certain quantity of nanoparticles was added beyond which these characteristics began to decrease. When more than one type of nanoparticle is dispersed, or micro rubber particles are added with a specific type of nanoparticle, the properties are more pronounced than when only a single type of particle is used.
      Citation: High Performance Polymers
      PubDate: 2022-05-08T06:04:27Z
      DOI: 10.1177/09540083221094964
       
  • New fluorinated poly(pyridine amide)s derived from
           2,6-bis(4-iodophenyl)-4-(4-trifluoromethylphenyl)pyridine by C–N
           coupling reaction

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      Authors: Hui Xie, Jing-Wei Zhao, Mei-Hong Wei, Zhi-Hui Huang, Xiao-Ling Liu
      Abstract: High Performance Polymers, Ahead of Print.
      2,6-Bis(4-iodophenyl)-4-(4-trifluoromethylphenyl)pyridine, as a new aromatic diiodide compound, was synthesized through a one-pot protocol by the sequential diazotization-iodination of 2,6-bis(4-aminophenyl)-4-(4-trifluoromethylphenyl)pyridine with KI/NaNO2/p-TsOH in acetonitrile at room temperature. A number of new aromatic fluorinated poly(pyridine amide)s containing 2,6-diphenyl-4-(4-trifluoromethylphenyl)pyridine units were prepared via a Pd(PPh3)2Cl2 catalyzed carbonylation polymerization of this diiodide, diamines and carbon monoxide in DMAc in the presence of PPh3 and 1,8-diazabicyclo[5,4,0]-7-undecene. These new polyamides with inherent viscosities of 0.63–0.72 dL/g were amorphous and easily soluble in amide type aprotic solvents such as NMP, DMAc, DMF and dimethyl sulfoxide at room temperature. Thermal analysis data up to 800°C in nitrogen showed their high thermal behavior with 5% weight loss temperature of 428–498°C and char yield of 62–69%. Their limiting oxygen index of 42.3–45.1 showed that the resulting poly(pyridine amide)s could be classified as “self-extinguishing polymers”. Also, their thin films exhibited high optical transparency with a cut-off wavelength of 324–373 nm.
      Citation: High Performance Polymers
      PubDate: 2022-05-06T02:28:42Z
      DOI: 10.1177/09540083221095760
       
  • Two high toughness and flame retardant DOPO-containing polybenzoxazines
           based on polyether-urea

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      Authors: Linlin Zhu, Xiangyang Yang, Yongbin Si, Liyuan Zhang, Xi Li, Lingling Hou
      Abstract: High Performance Polymers, Ahead of Print.
      In this current work, two new-style DOPO-containing benzoxazines based on polyether-urea were successfully synthesized by a modified version via three-step procedures, and the corresponding polybenzoxazines with high toughness and flame retardancy were obtained by thermal activated polymerization. The single and double DOPO-containing benzoxazines were named as BzD1 and BzD2, respectively. The corresponding polymers followed were named as PBzD1 and PBzD2, respectively. The curing behaviors of the two new benzoxazines were investigated by differential scanning calorimetry. The thermal and mechanical properties of the materials were evaluated by TGA and dynamic mechanical analysis. The flame retardant properties were elucidated via limiting oxygen index (LOI). The toughness properties were expressed by bending tests. The results showed that the Yc for PBzD1 and PBzD2 were approximately 22.2% and 24%, respectively, distinctively higher than the value 2.57% of pristine polybenzoxazine PBz1, at 800 °C in N2 atmosphere. The Tgs of PBzD1 and PBzD2 distinctly increased by 42.8 °C and 20 °C, respectively, in comparison to −35 °C for pristine PBz1. The LOI values of PBzD1 and PBzD2 were 28.5 and 31, respectively. The length and weight-loss of PBzD1 and PBzD2 samples were significantly less than that of PBz1 when they were burned in the air environmental condition. The burning behavior demonstrated that the flame retardant properties was obviously improved as DOPO was introduced. All of the three specimens of PBz1, PBzD1 and PBzD2 presented excellent flexible property.
      Citation: High Performance Polymers
      PubDate: 2022-05-05T11:32:06Z
      DOI: 10.1177/09540083221095761
       
  • Ionic liquid dispersed highly conducting polymer electrolyte for
           supercapacitor application: Current scenario and prospects “ICSEM
           2021”

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      Authors: Shreya Mathela, Sushant Kumar, Pramod K Singh, Ram Chandra Singh, PK Shukla, Vijay Singh, IM Noor, Sunanda Kakroo, Aysh Y Madkhli, Richa Tomar
      Abstract: High Performance Polymers, Ahead of Print.
      Ionic liquid (IL) is now being considered as a novel contender in the development of highly conducting polymer electrolytes rather than a solvent. It has a significant impact on the electrochemical performance of polymer electrolytes. This study emphasizes the significance of low viscosity IL dispersion within a polymer (PVA) matrix. The electrical, structural and photoelectrochemical properties of the IL-doped polymer electrolyte are discussed in detail. These highly conducting IL doped solid polymer electrolytes show promise towards the development of highly efficient Supercapacitors.
      Citation: High Performance Polymers
      PubDate: 2022-05-04T07:16:10Z
      DOI: 10.1177/09540083221099432
       
  • Synthesis and characterization of phosphonated polybenzimidazole membranes
           with improved proton conductivity for high-temperature proton exchange
           membrane applications

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      Authors: Yueming He, Meng Wang, Hongzhou Chen, Xiaohong Peng
      Abstract: High Performance Polymers, Ahead of Print.
      The study has synthesized a novel dicarboxylic acid monomer with phosphonate group, 2-((diethoxyphosphoryl)methyl)-[1,1′-biphenyl]-4,4′-dicarboxylic acid (PMDA), and then successfully prepared a series of polybenzimidazole polymers containing methyl-phosphonic acid group and ether group (POPBI-x) via the polycondensation between PMDA, 4,4′-oxybis (benzoic acid) (OBBA) and 3,3′-diaminobenzidine (DAB) in polyphosphoric acid (PPA)/phosphorus pentoxide (P2O5). Meanwhile, the smooth membranes were fabricated via the solution-casting method. Results of TGA, the Fenton’s reagent immersing test, and the tensile test showed that the POPBI-x membranes possessed good thermo-oxidative stability and mechanical properties. Moreover, compared to poly[2,2′-(p-oxydiphenylene)-5,5′-benzimidazole] (OPBI), POPBI-x had a significant enhancement in the phosphoric acid doping level, PA retention ability, and proton conductivity after doped with phosphoric acid (PA) because the methyl-phosphonic acid groups on the backbones enriched the hydrogen bonding interactions between the polymer chain and phosphoric acid. Notably, the POPBI-19 exhibited a high phosphoric acid doping level of approximately 11.3 and excellent proton conductivity of approximately 0.0523 S cm−1 at 180°C under anhydrous conditions.
      Citation: High Performance Polymers
      PubDate: 2022-05-04T07:09:12Z
      DOI: 10.1177/09540083221092396
       
  • A hyper-cross-linked polymer derived from pitch as an efficient adsorbent
           for VOCs

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      Authors: Huan Liu, Zi-Xin Liu, Hao-Ran Yu, Yan Wang, Feng-yun Zhao, Jian-ying Wang
      Abstract: High Performance Polymers, Ahead of Print.
      Hyper-cross-linked polymers (HCPs) have been attracted widespread attention as adsorbents in recent years. A series of HCPs (HCP-1, HCP-2 and HCP-3) were synthesized via a Friedel-Crafts reaction using low-cross-linked pitch as precursor and dichloromethane (DCM) as cross-linking reagent and solvent. The prepared HCPs were characterized by N2 adsorption, Fourier transform infrared (FI-IR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA) and static water contact angle. The resultant HCPs possess micro/meso pore structures and a high stability. The Brunauer-Emmett-Teller (BET) surface areas of HCP-1, HCP-2 and HCP-3 are 152 m2·g−1, 467 m2·g−1 and 447 m2·g−1, respectively. Their total pore volumes vary from 0.207 cm·g−1 to 0.545 cm3·g−1 and following the sequence of HCP-1
      Citation: High Performance Polymers
      PubDate: 2022-05-03T02:46:51Z
      DOI: 10.1177/09540083221098159
       
  • Synthesis and characterization of an adamantane-based copolyimides with
           high transparency

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      Authors: Qi Li, Sung S Park, Chang-Sik Ha, Shuai Yuan, Liyi Shi
      Abstract: High Performance Polymers, Ahead of Print.
      In this work, a copolyimide (Co-PI) film with high transparency was prepared by the copolymerization of hexafluoroisopropylidene)diphthalic anhydride (6FDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 2,2′-Bis(trifluoromethyl)benzidine (TFMB) and adamantane-1,3-diamine (DAA). The effects of DAA monomers on the optical, thermal, and mechanical properties of the co-PIs were discussed in detail. We found that the preparation of polyimide (PI) based on the combination of two dianhydrides and two diamines could obtain the co-PI film with excellent comprehensive performance due to the synergy between the -CF3 group, the aliphatic ring and the aromatic structure. Through the structure and composition optimization, the co-PI film with 1.30% DAA (Q3) has a Tg of 374oC, T5 higher than 530oC, T430 of 82% and the tensile strength higher than 145 MPa. These results indicate that the Co-PI films can be successfully utilized in the development of novel heat-resistant plastic substrates for the optoelectronic engineering applications.
      Citation: High Performance Polymers
      PubDate: 2022-05-02T04:25:12Z
      DOI: 10.1177/09540083221097381
       
  • A novel flame retardant consisting of functionalized Salen-Ni based
           polyphosphazene microspheres

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      Authors: Hailong Yu, Jinfeng Cui, Haiyin Zhang, Baoping Yang, Junhong Guo, Bo Mu, Zhaohui Wang, Huaming Li, Li Tian
      Abstract: High Performance Polymers, Ahead of Print.
      A functionalized cross-linked polyphosphazenes microsphere (Salen-PZN-Ni@DHPP-PTS) was prepared by wrapping Salen-Ni basis polyphosphazenes (Salen-PZN-Ni) with a kind of hybrid flame retardant (DHPP-PTS) to improve the flame retardancy and smoke suppression properties of epoxy (EP) composites. Thermogravimetric analysis showed that the addition of Salen-PZN-Ni@DHPP-PTS greatly improved the thermal stability of the EP composites. The addition of 5 wt% Salen-PZN-Ni@DHPP-PTS remarkably improved the fire safety of EP, which was illustrated by the results of the cone calorimeter. For example, the peak heat release rate and total heat release rate of the EP composites were reduced by 44.2% and 33.1%, respectively. The limiting oxygen index value of 5% Salen-PZN-Ni@DHPP-PTS/EP composite reached 29.8% and UL-94 achieved V-1 rating. In addition, the introduction of Salen-PZN-Ni@DHPP-PTS effectively suppressed the production of toxic CO and other volatiles. Meantime, the synergistic effect between Salen-PZN-Ni and DHPP-PTS was found. The potential flame retardant mechanism of Salen-PZN-Ni@DHPP-PTS is regarded as the synergistic catalytic carbonization effect and the extremely thermally stable components forming. Enhanced fire safety of EP composites by synergistic interaction of various components (nickel and DHPP-PTS) with polyphosphazenes microspheres.
      Citation: High Performance Polymers
      PubDate: 2022-04-30T09:18:29Z
      DOI: 10.1177/09540083221094972
       
  • New polyimide ionomers derived from
           4,4′-diamino-[1,1′-biphenyl]-2,2′-disulfonic acid for fuel cell
           applications

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      Authors: Svetlana V Kononova, Denis A Sapegin, Galina N Gubanova, Nadezhda V Afanas’eva, Andrei N Didenko, Elena N Popova, Elena N Vlasova, Valentin M Svetlichnyi, Anatoliy Y Volkov, Milana E Vylegzhanina, Natalya V Zakharova, Andrey A Nechitailov, Natalia K Zelenina
      Abstract: High Performance Polymers, Ahead of Print.
      The set of important properties of polymers necessary for their use as fuel cell membranes, such as film-forming properties, stability in acidic aqueous media, thermal stability, proton conductivity, is determined by their chemical structure, which provides not only basic and fragmentary mobility of the polymer chain but also complex supramolecular structural features (in particular, phase separation). The effect of the chemical structure of aromatic polyimide sulfonic acids, containing a fragment of 4,4′-diamino[1,1′-biphenyl]-2,2′-disulfonic acid (BDSA), on their membrane-forming properties is discussed, as well as the membrane stability under the conditions of a hydrogen-air fuel cell. The research is aimed at investigating sulfonated polyimides based on the commercially available rigid monomer - BDSA and flexible dianhydrides with an electron donor in their structure. As a model for this study, two aromatic anhydrides with flexible -O- bonds were chosen for investigating the potential of corresponding polyimide films in application to proton exchange membranes. The synthesized sulfonic acid polyimide BDSA-SPI-4(H) is of interest as a proton-conducting membrane polymer for direct energy conversion electrochemical devices and has shown to be a promising material for this group of devices. It is suggested that the presence of the flexible electron donor bonds in the structure of dianhydride should increase the stability of the membranes prepared from BDSA. The properties of polyimide sulfonic acids from the aforementioned diamine and dianhydrides of different fragmentary flexibility implemented in this work could help the understanding of the connection between chemical structure and properties of the material in application to proton exchange membranes development.
      Citation: High Performance Polymers
      PubDate: 2022-04-28T01:59:38Z
      DOI: 10.1177/09540083221093759
       
  • Synthesis of a highly efficient flame retardant containing triazine and
           pentaerythritol phosphate groups and its intumescent flame retardancy on
           epoxy resin

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      Authors: Shengpeng Liu, Huan Wei, Yun Xiong, Yigang Ding, Lili Xu
      Abstract: High Performance Polymers, Ahead of Print.
      A novel phosphorus-nitrogen-containing flame retardant (DOPT) has been successfully synthesized via the substitution reaction of cyanuric chloride, pentaerythritol phosphate and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. The chemical structure of DOPT was confirmed by 1H, 31P and 13C nuclear magnetic resonance, Fourier transform infrared spectroscopy and elemental analysis. Then, flame retardants were added to epoxy resin to prepare epoxy resin composites by pouring method. Thermal properties, flame retardancy, and combustion behavior of epoxy resin composites were evaluated by thermogravimetric analysis, vertical burning, limiting oxygen index and cone calorimeter test. Thermogravimetric analysis test showed that the carbon residue rate of DOPT at 800°C reached 52.53%, which indicated that the introduction of high-efficiency char-forming agent triazine and pentaerythritol phosphate groups could significantly improve its char-forming performance and thermal stability. The epoxy resin composite achieved vertical burning V-0 grade and the limiting oxygen index value reached 35.5% when 7 wt% DOPT was incorporated. Furthermore, the cone calorimeter test results manifested that the addition of DOPT stimulated degradation of the epoxy resin matrix during the combustion process and accelerated the formation of an expanded and dense carbon layer. Additionally, the incombustible gas produced during the decomposition of DOPT had played a flame-retardant effect in the gas phase. Hence, compared with neat epoxy resin, the total heat release and total smoke production of the EP-7 wt% DOPT composite decreased by 14.0% and 25.3%, respectively. Moreover, owing to the excellent compatibility and the strong interface effect between DOPT and epoxy resin, the addition of DOPT also enhanced the mechanical and fire resistance properties of the epoxy resin composite. Therefore, it is proposed that DOPT could be exploited as an economical and high-efficiency flame retardant, and it has considerable prospects in flame retardant epoxy resin composites.
      Citation: High Performance Polymers
      PubDate: 2022-04-26T05:08:37Z
      DOI: 10.1177/09540083221098160
       
  • Transparent polyimide films with ultra-low coefficient of thermal
           expansion

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      Authors: Tingting Zhang, Zhenghui Yang, Fengyu Piao, Haiquan Guo
      Abstract: High Performance Polymers, Ahead of Print.
      According to the application requirements of colorless transparent polyimide (CPI) film for low coefficient of thermal expansion (CTE) in the field of OLED display, the new aromatic dianhydride monomers with amide bond structure were synthesized, namely s-ABDA, i-ABDA, EADA. Furthermore, a series of CPI films were prepared by two-step method from the reaction of as-synthesized dianhydrides with 2.2′-bis (trifluoromethyl) −4.4′-diaminobiphenyl (TFMB) or trans-1.4′-cyclohexanediamine (t-CHDA). Based on the analysis of performance results, the incorporation of amide group and biphenyl, benzene or ether bond into dianhydride monomer helped this new type of transparent polyimide film with excellent optical properties (T550 nm> 88%), great heat stability (CTE < 4.4 ppm/K; Tg> 314°C; Td5%> 478°C) and good mechanical strength (σ> 208 MPa). The film s-ABDA/TFMB showed ultra-low CTE value at 4.4 ppm/K, aligning with the maximum birefringence, indicating that the role of hydrogen bonding was of great benefit to the regulation of thermal expansion.
      Citation: High Performance Polymers
      PubDate: 2022-04-25T06:07:52Z
      DOI: 10.1177/09540083221097384
       
  • Effect of perlite on the thermal conductivity, thermal degradation and
           mechanical properties of epoxy materials

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      Authors: İbrahim Kırbaş
      Abstract: High Performance Polymers, Ahead of Print.
      In this study, the thermal conductivity, thermal degradation and mechanical properties of the perlite added epoxy materials were investigated. Perlite was added into the epoxy resin (EP) at the rate of 2%, 4%, 6%, 8% and 10% compared to the total mass. For the analysis of these epoxy materials, the thermal conductivity, density, hardness, X-ray diffraction (XRD), FTIR spectra, thermogravimetric analysis (TGA), tensile strength, flexural strength, limit oxygen index (LOI) and vertical burning tests were carried out. With the added perlite (PER10), a decrease of 24.03% occurred in the thermal conductivity coefficient compared to the pure EP material. A maximum decrease of 6.86% was detected in its density. It gained fire retardant feature as it increased from 6.15% to 28.71% in V-0 and carbon residue as inflammability class. Despite the decrease of tensile stress, tensile modulus increased. The maximum increase PER02 was 36.9%. It did not provide any improvement in terms of other mechanical properties.
      Citation: High Performance Polymers
      PubDate: 2022-04-25T03:42:56Z
      DOI: 10.1177/09540083221092147
       
  • Synthesis and properties of polyarylene ether nitrile random copolymer
           containing naphthalene and biphenyl structure

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      Authors: Ying Zhu, Lifen Tong, Xiaobo Liu
      Abstract: High Performance Polymers, Ahead of Print.
      A novel series of polyarylene ether nitrile (PEN) random copolymers with a higher Tg and better mechanical and electrical properties were synthesized through nucleophilic substitution polycondensation. In the means of adjusting mole ratio of 4,4′-dihydroxybiphenyl (BP) to 2,7-naphthalenediol (ND), the performance of PEN random copolymer could be controlled. The FTIR, SEM, DSC, TGA, AR, intrinsic viscosity, and electrical and mechanical properties were performed on the samples. All the samples exhibited excellent thermal performance with Tg over 210°C, Td5% over 520°C, and heat conduction higher than 0.4 W/m·k. The PEN copolymers when the molar ratio of ND was 15% had the best comprehensive performances, whose Tg was 215°C, Td5% was up to 554.31°C, thermal conductivity was 0.4430 W/m·k, tensile strength was 113.27 MPa, and stable dielectric constant (at frequency from 103 Hz to 106 Hz) was lower than 4. As a result, this PEN copolymer obtained in this paper could provide practical value and possibility in further application in the filed including machine manufacture industry, electronic materials, and automotive industry.
      Citation: High Performance Polymers
      PubDate: 2022-04-22T05:40:56Z
      DOI: 10.1177/09540083211069513
       
  • Novel vanillin-based benzoxazine containing phthalonitrile thermosetting
           system: Simple synthesis, autocatalytic polymerization and high
           thermomechanical properties

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      Authors: Sarah Soudjrari, Mehdi Derradji, Bouchra Amri, Khawla Djaber, Oussama Mehelli, Sana Tazibet, Slimane Abdous, Noureddine Ramdani, Wenbin Liu, Azzedine Khadraoui
      Abstract: High Performance Polymers, Ahead of Print.
      Benzoxazine containing phthalonitrile, as one of the most advanced high performance thermosetting resin, has gained a lot of attention in the last decades. Indeed, the combination of the thermally activated ring-opening polymerization of the benzoxazine and the cyano addition reaction of the phthalonitrile allows the development of robust polymeric networks. Following this path, a renewable natural resource, vanillin, was used to develop a new benzoxazine containing phthalonitrile thermosetting system. The newly developed monomers present the advantage of a simple synthesis process along with an autocatalytic polymerization mechanism. The molecular structures of the synthesized monomers were characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy . Thermal properties were also characterized by differential scanning calorimetry and thermogravimetric analysis . Typically, the newly developed monomers showed excellent thermal stability with starting decomposition temperatures over 496.4°C with a char yield at 800°C of about 80.7%. The thermomechanical properties were investigated by dynamic mechanical analyzer and the fractured surfaces were studied by scanning electron microscopy Globally, the newly developed partially bio polymer showed outstanding thermal resistance along with excellent thermomechanical properties.
      Citation: High Performance Polymers
      PubDate: 2022-04-21T01:53:23Z
      DOI: 10.1177/09540083221088738
       
  • Multi-synergy effects-induced high electric breakdown field in polymer
           composites via 0D/2D design

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      Authors: J R Men, Y G Wang, Aditya Jain, J X Hu
      Abstract: High Performance Polymers, Ahead of Print.
      Constructing polymer composites containing zero-dimensional (0D) nanoparticles and two-dimensional (2D) lamellae is a simple and effective strategy to obtain high energy storage performance. Although the hexagonal boron nitride nanosheets (BNNSs) are widely used in energy storage areas, the low yield hinders their application. This work employed Al2O3 (AO) nanoparticles and thick hexagonal boron nitride (h-BN) lamellae to fabricate poly (vinylidene fluoride) (PVDF)-based films. An expected synergy effect on the breakdown strength (Eb) is achieved as the filler content and ratio change. A high Eb (450 MV/m), which is 110 MV/m higher than the pure PVDF (340 MV/m), was acquired with a small loading (4 wt.%). The analysis suggests multiple synergy effects between AO and h-BN on leakage current, crystallinity, melting point, and Young’s modulus contribute to the high Eb. However, a desirable low leakage current is an indispensable part of these properties. In addition to this, the mechanisms behind these synergy effects were discussed. A comprehensive comparison indirectly proves that the AO particles can increase the dispersibility of h-BN lamellae. Besides, the dielectric behavior and energy storage performance were comprehensively examined.
      Citation: High Performance Polymers
      PubDate: 2022-04-20T12:39:45Z
      DOI: 10.1177/09540083221081420
       
  • High performance poly(isatin alkyl-terphenyl)s proton exchange membranes
           with flexible alkylsulfonated side groups

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      Authors: Yannan Wang, Yajie Wang, Maolian Guo, Tao Ban, Xiuling Zhu
      Abstract: High Performance Polymers, Ahead of Print.
      Hydrocarbon-based polymer proton exchange membranes (PEMs) free of heteroatom linkages are supposed to be an attractive alternative for the most advanced perfluorosulfonic acid PEMs, but it is challenging to synthesize them. Here we disclosed a series of aliphatic chain-containing poly(isatin diphenyl-co-terphenyl)(PIDT) copolymers, which were conveniently prepared by superacid-catalyzed Friedel-Crafts polycondensation. Subsequently, the sulfonated copolymer (SPIDT) membranes were prepared by the grafting of side-chain sulfonic acid groups. Due to the formed continuous and efficient nanoscale proton transport channel, these PEMs exhibited excellent proton conductivity showing 186 mS/cm at 80°C, higher than Nafion115 (150 mS/cm). Meanwhile, the prepared membranes exhibited good oxidative stability. The residual weight of the membranes is still greater than 98 wt % after 1 h immersion in Fenton’s reagent at 80°C. Notably, the direct borohydride-hydrogen fuel cell (DBHFC) equipped with SPIDT-50 membrane as the diaphragm showed the peak power density of 71 mW•cm−2 at 25°C, which was greater than that of Nafion115 (63 mW•cm−2). Therefore, the hydrocarbon-based PEMs prepared in this study show promise for application in fuel cells.
      Citation: High Performance Polymers
      PubDate: 2022-04-20T05:45:43Z
      DOI: 10.1177/09540083221089570
       
  • A polyimide/poly(N-vinylimidazole) membrane for CO2/CH4 separation with
           high selectivity and permeability

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      Authors: Shuo Yan, Haibin Yu, Zan Chen
      Abstract: High Performance Polymers, Ahead of Print.
      Membranes with both good permeation and selectivity are highly desired for gas separations. In this study, we synthesized a new 6FDA-type polyimide copolymer 6FDA-BDTA-ODA, and then an organic polymer of poly (N-vinylimidazole) was doped into the polyimide to prepare mixed matrix membranes (MMMs). We also studied the effect of poly (N-vinylimidazole) contents on the separation performance of MMMs. The results showed that the ideal selectivity for CO2/CH4 was improved by adding the poly (N-vinylimidazole) filler. The ideal selectivity reached 63.5 with 6 wt% poly (N-vinylimidazole) loading with the permeability of 29.2 Barrer. The highly permeable MMMs showed a considerably enhanced performance for CO2/CH4 that close to the 2008 Robeson upper-bound. The gas separation performance of the prepared MMMs for CO2/CH4 was improved compared to that of the pure polymer membrane, indicating that the copolyimide/poly (N-vinylimidazole) MMMs have promising applications in CO2/CH4 gas separation.
      Citation: High Performance Polymers
      PubDate: 2022-04-20T04:30:37Z
      DOI: 10.1177/09540083221090671
       
  • Preparation and properties of an interpenetrating network polymer based on
           polydicyclopentadiene and phenolic resin

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      Authors: Weicheng Yang, Guibao Hu, Song Guo, Xinfeng Qiao, Yong Luo, Haiyan Ma
      Abstract: High Performance Polymers, Ahead of Print.
      In this paper, phenolic resin (PF) and dicyclopentadiene (DCPD) monomers were mixed in different proportions. Under the action of a new generation of ruthenium carbene catalysts, DCPD was polymerised in situ. Polydicyclopentadiene (PDCPD)/PF interpenetrating polymer networks (IPNs) were prepared using the casting curing moulding process. The structure and properties of the prepared IPNs were characterised using Fourier infrared spectroscopy (FT-IR), apparent crosslinking degree, thermal weight loss, mechanical properties, impact resistance and scanning electron microscopy (SEM). The study results showed that the conversion of DCPD did not change with the addition of PF. But when its content exceeds 10%, the crosslinking degree of PDCPD decreases. When the PF content is 10%, the maximum bending strength of PDCPD/PF IPNs is (104.5 ± 1.3) MPa, maximum tensile strength is (74.5 ± 1.4) MPa, and maximum-notched impact strength is (4.2 ± 0.2) kJ/m2. Compared with PDCPD, the bending strength is increased by 22.7%, tensile strength is increased by 32.6%, and notched impact strength is increased by 31.3%, but the thermal stability has no major impact at this time. PF has good dispersibility and compatibility in DCPD. Due to the interpenetrating network structure of PF and PDCPD, the interpenetrating interlocking of the PF molecular chain and PDCPD crosslinked network restricts its movement. Its performance reached the optimum, and the PDCPD/PF IPNs with excellent performance was successfully prepared.
      Citation: High Performance Polymers
      PubDate: 2022-04-20T03:55:09Z
      DOI: 10.1177/09540083221094725
       
  • Change in charge carrier dynamics by incorporating ionic liquid into poly
           ethylene oxide–based sodium acetate polymer electrolytes

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      Authors: Sandhya Gupta, Pramod K Singh, B Bhattacharya
      Abstract: High Performance Polymers, Ahead of Print.
      Poly (ethylene oxide) based sodium ion conducting solid polymer electrolytes films (salt NaCH3COO) with varying amounts of an ionic liquid, 1-ethyl 3-methylimidazolium thiocyante were prepared by solution-cast method. All the prepared samples were characterized in detail for their ion transport characteristics at room temperature and temperature dependent behavior as well using electrochemical impedance spectroscopy. The measurement of ionic conductivity shows the many fold enhancement due the incorporation of ionic liquid in the polymer electrolyte matrix. The charge carrier density and mobility of charge carriers has been calculated and used for explaining the conductivity variations in these films. The increase in conductivity has been explained in terms of plasticization effect of ionic liquid and number of charge carriers per unit volume of electrolyte.
      Citation: High Performance Polymers
      PubDate: 2022-04-19T05:19:22Z
      DOI: 10.1177/09540083221088737
       
  • Development of PAMAM dendrimer-modified magnetic polyoxometalate: A novel
           platform to reinforce mechanical and thermal properties of diglycidyl
           ether of bisphenol A/isophorone diamine hardener epoxy

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      Authors: Behrooz Maleki, Fariba Jafari-Soghieh, Heshmatollah Alinezhad, Milad Ghani, Ali jamshidi
      Abstract: High Performance Polymers, Ahead of Print.
      The present study explores the mechanical and thermal properties of DGEBA/IPD epoxy reinforced with dendrimer-functionalized magnetitepolyoxometalate nanoparticles. Magnetic iron oxide nanoparticles (MNP’s) were stabilized and functionalized by the poly (amido-amine) dendrimer via encapsulation within dendrimer; afterwards, H9 [α-P2V3W15O62] polyoxometalate (POM) was modified with dendrimer-functionalized magnetic iron oxide nanoparticles (DMNP’s). The polyoxometalate can be complexed with DMNP’s via protonation of dendrimer amino groups. In the next step, dendrimer-functionalized magnetitepolyoxometalate nanoparticles (DMNP’s-POM) were loaded into diglycidyl ether of bisphenol A (DGEBA) epoxy resin. The DMNP’s-POM nanoparticles can initiate polymerizations of epoxy resin with isophorone diamine hardener (IPD); on the other hand, the terminal amino groups of the dendrimer in the DMNP’s-POM nanoparticles allow them to be covalently linked to the polymer matrix alongside the main amine hardener. The resulting epoxy/magnetitepolyoxometalate nanocomposites (DMNP’s-POM@EN 5%) are thoroughly characterized by FT-IR, FE-SEM, and XRD analysis. Probing thermal behaviors of epoxy/magnetitepolyoxometalate nanocomposites by TGA reveals that the resulting composites are degraded thermally through a simple one-step process with an initial degradation close to 340°C, and show significant stability toward heat. Dynamic Mechanical Thermal Analysis indicates that no considerable agglomerate is formed during the synthesis process, and the incorporated nanoparticles somewhat limit the segmental motions of the epoxy macromolecular chains.
      Citation: High Performance Polymers
      PubDate: 2022-04-18T03:39:04Z
      DOI: 10.1177/09540083221089563
       
  • Preparation and properties of silicon-containing benzoxazine with high
           thermal stability

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      Authors: Hui Li, Cijie Long, Kai Zeng, Yuntao Li, Chunxia Zhao, Dong Xiang, Yuanpeng Wu, Bin Wang, Zhangmei Sun, Yusheng Que
      Abstract: High Performance Polymers, Ahead of Print.
      A silicon-containing benzoxazine (PDpsp-a) was synthesized from bis(p-hydroxyphenyl)diphenylsilane, aniline, and paraformaldehyde. The structure of the monomer was supported by 1H-NMR and FTIR spectra. The curing behavior of benzoxazine was evaluated by differential scanning calorimetry and in-situ FTIR spectra. The thermal properties were studied by MDSC, TGA, and Py-GC/MS. The results indicated that the characteristic peak of oxazine ring began to disappear when the temperature was heated to 180°C and completely disappeared at 260°C. The polybenzoxazine (PDpsp-a) possessed a high glass transition temperatures (174°C) and had good thermal stability (T10 = 420°C). In the pyrolysates of polybenzoxazine (PDpsp-a), no silicon-containing compounds, no phenol species, and more benzene were detected, we speculated that the Ar-Si bond would fracture with the increase of temperature. The benzene was volatilized from the system as a pyrolysis product and the silicon could react with oxygen to form siloxanes remained in the carbon residue in the form of siloxane compounds. The formed silica layer could endow the silicon-containing polybenzoxazine high thermal degradation stability and high char yield.
      Citation: High Performance Polymers
      PubDate: 2022-04-01T11:29:05Z
      DOI: 10.1177/09540083221083474
       
  • Fabrication and tribological behavior of MnO2/epoxy nanocomposites

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      Authors: Md Z Hussain, Sabah Khan
      Abstract: High Performance Polymers, Ahead of Print.
      Tribology is the study of moving surfaces, and it has a variety of effects on our lives. From an economic point of view, wear is one of the most important aspects of an industry’s viability. Parts of the machine can wear out, and they need to be replaced. This is especially important for polymer-based materials. Therefore, it is important to reduce maintenance costs and improve machine reliability in a variety of engineering applications through proper material selection. The present investigation deals with the fabrication of manganese dioxide (MnO2)/epoxy nanocomposite and investigates its tribological properties. The MnO2/epoxy nanocomposites were fabricated via a solution mixing technique. The phase identification and surface morphology of the sample was examined by X-ray diffractometer and field emission scanning electron microscope, respectively. The mass density, micro-hardness, and specific wear rate data of samples revealed that the mass density, micro-hardness, and wear resistance of the samples increased with the addition of MnO2 in the epoxy matrix. The nanocomposite sample containing 0.5 wt. % MnO2 loading in the epoxy matrix shows higher density, micro-hardness, and wear resistance compared to other samples. The result also shows that with the addition of MnO2 in the epoxy matrix, the coefficient of friction of the samples is increased. The percentage reduction in specific wear rate due to the addition of 0.5 wt. % MnO2 in neat epoxy is 68.10%, whereas the percentage increase in the coefficient of friction is 19.30%. The results of the analysis of variance show the effect of adding wt. % of MnO2 in the epoxy matrix is significant in the tribological responses. The worn surface analysis shows that the fatigue wear mode seems to be the dominating mode of wear for all samples as compared to the other modes of wear. The properties of MnO2/epoxy nanocomposite data revealed that the developed material may be used in the automotive industry as a structural material, fabrication of snow sled, ball bearing housing, or plastic gear materials with adequate lubrication.
      Citation: High Performance Polymers
      PubDate: 2022-04-01T07:36:32Z
      DOI: 10.1177/09540083221079510
       
  • Synthesis of oligomeric phthalonitrile resins containing imide units and
           study of the methylene-cyano thermal synergistic polymerization effect

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      Authors: Huanxin Xie, Xian He, Yu Pu, Jiangbo Lv, Menghao Chen, Ke Zeng, Gang Yang
      Abstract: High Performance Polymers, Ahead of Print.
      The meta- and para-catenated methylene-containing phthalonitrile oligomers were prepared from the reaction of an excess amount of 4,4′-(4,4′-isopropylidenediphenoxy) bis-(phthalic anhydride) (BPADA) with 4,4′-Methylenedianiline (MDA) in a N, N-dimethylformamide/ toluene solvent mixture, followed by end-capping agent with 4-nitrophthalonitrile or 4-phenoxyaniline in a two-step, one-pot reaction. Differential scanning calorimetry (DSC) showed that both PN oligomers exhibited low softening points. The self-catalyzed curing reactivity of the PN oligomers was confirmed by the isothermal rheological measurements. Fourier transform infrared spectroscopy (FTIR) and ultraviolet and visible spectrophotometry (UV–Vis) data of the pre-curing resins were employed to investigate the chemical structure of the pre-cured resins, suggesting that oligomers generated crosslinking sites, including triazine, isoindoline, and phthalocyanine. The results further confirmed the self-catalyzed curing reactivity of the oligomers. Thermal properties were investigated by dynamic mechanical analysis (DMA) and thermal gravimetric analysis (TGA), demonstrating good thermal properties of the cured resins. The glass transition temperatures (Tgs) of PIPN-1-325, PIPN-1-350, PIPN-1-375 were in the range of 285–345°C, the 5% weight loss temperature (T5%) was observed at 482°C. The PIPN-2-325, PIPN-2-350, PIPN-2-375 showed Tgs ranging from 293 to 370°C, and T5% of the resins were in the range of 481–501°C. Then the isothermal rheological results of model compound and PN oligomers implied that the curing process of PN oligomers was closely related to the methylene-cyano radical thermal synergistic polymerization (TSP) effect proposed in our previous research, and then a revised curing mechanism (radical TSP mechanism) was proposed.
      Citation: High Performance Polymers
      PubDate: 2022-03-29T06:23:30Z
      DOI: 10.1177/09540083211073658
       
  • Plasticizing effect on polyethylene oxide doped ammonium perchlorate

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      Authors: Rana Pratap, Pramod K Singh, Tejas Sharma, Vijay Singh, Mustafa A Alheety, Sushant Kumar, Aysh Y Madkhli, IM Noor, Ibrahim Zakariya’u, Abhimanyu Singh
      Abstract: High Performance Polymers, Ahead of Print.
      Plasticized polymer complex films of polyethylene oxide with ammonium perchlorate (NH4ClO4) are synthesized by using solution cast technique. Propylene carbonate (PC) used as dopant to enhance conductivity of polymer electrolyte. The prepared films are characterized in detail using X-ray diffraction, infrared spectral analysis, transient ionic current, and electrochemical impedance studies. Plasticized polymer electrolyte shows high ionic conductivity (∼10−4 S/cm) which appear as novel electrolyte for electrochemical devices.
      Citation: High Performance Polymers
      PubDate: 2022-03-27T02:15:44Z
      DOI: 10.1177/09540083221084897
       
  • Ionic liquid-modified polyimide membranes with in-situ-grown polydopamine
           for separation of oil–water emulsions

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      Authors: Peng Qi, Hongge Jia, Qingji Wang, Guiming Su, Shuangping Xu, Mingyu Zhang, Yanqing Qu, Fuying Pei
      Abstract: High Performance Polymers, Ahead of Print.
      Leakage of oily industrial waste is not only a serious environmental and ecological hazard but also poses a significant health risk to people. Membrane separation, which is cost-effective and efficient, is one of the best solutions for reducing pollution discharge through oil–water separation. In this study, polydopamine (PDA) was incorporated into electrostatically spun ionic liquid-capped polyimide (IL-PI) membranes through an in situ growth method; the membranes exhibited the strong adsorption properties of PDA. The polyimide fibers were hydrophilically modified with an IL, which contains several hydrophilic groups, and PDA. Adjusting the polymerization time resulted in the formation of a composite membrane, which could effectively separate oil–water emulsions. Scanning electron microscopy analysis showed that with an increase in the PDA coating time, the PDA content in and on the surface of the composite membrane fibers significantly increased. In addition, the surface contact angle of the membrane decreased from 72.87° to 12.06° with the addition of the PDA coating, while the wettability was significantly improved. The PDA-modified fibrous membranes showed good separation of the emulsified oil–water mixtures. The maximum membrane flux and separation efficiency achieved was 280 L·m−2·h−1 and>99%, respectively. After 10 repeated cycles, the separation efficiency was maintained at>92%. This approach can be used for the design of future wastewater treatment solutions.
      Citation: High Performance Polymers
      PubDate: 2022-03-19T08:48:26Z
      DOI: 10.1177/09540083221075949
       
  • Ionic liquid doped solid polymer electrolyte: Synthesis, characterization
           and applications ICSEM-2021

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      Authors: Abhimanyu Singh, Tejas Sharma, Pawan Singh Dhapola, Sushant Kumar, Diksha Singh, Gaurav Nath, Vijay Singh, Mustafa A Alheety, Sunanda Kakroo, Pramod K Singh
      Abstract: High Performance Polymers, Ahead of Print.
      In this paper, we have used polymer polyethylene oxide as a host matrix and novel electrolyte ionic liquid 1-ethyl-3-methylimidazolium tricyanomethanide as an dopant to increase ionic mobility. Different characterization techniques like Electrochemical impedance spectroscopy, dielectric measurement, Fourier transform, X-ray diffraction, polarized optical microscopy, thermogravinometric analysis were used to identify the electrical, optical, structural and thermal properties. A laboratory scale supercapacitor has been fabricated using optimized solid polymer electrolyte film as an electrolyte and porous carbon derived from corn starch which shows a specific capacitance 13.6 F/g at 50 mV/s scan rate.
      Citation: High Performance Polymers
      PubDate: 2022-03-11T02:44:18Z
      DOI: 10.1177/09540083221081081
       
  • Synthesis and characterization of new aromatic copoly(ether amide)s
           bearing 4-trifluoromethylphenyl-2,6-diphenylpyridyl moieties in the main
           chain

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      Authors: Yang-Ting Yu, Jing-Wei Zhao, Mei-Hong Wei, Zhi-Hui Huang, Xiao-Ling Liu
      Abstract: High Performance Polymers, Ahead of Print.
      A series of new aromatic fluorinated copoly(ether amide)s containing 4-(4-trifluoromethylphenyl)-2,6-diphenylpyridyl moiety with high molecular weight were prepared by a low-temperature solution polycondensation of terephthaloyl chloride with 4-(4-trifluoromethylphenyl)-2,6-bis(4-aminophenyl)pyridine and 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene with various mole ratios of the two monomers ranged from 20/80 to 80/20. All polymers were amorphous and soluble in common organic solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide and tetrahydrofuran at room temperature or upon heating at 70oC, and could be solution cast into transparent, tough, and flexible films with tensile strengths of 66.9–80.2 MPa, tensile moduli of 1.84–2.03 GPa, and elongations at break of 11.8–20.7%. These new polyamides displayed good thermal stability with gradually increasing of glass temperatures of 259–285oC as an increase of the 4-(4-trifluoromethylphenyl)-2,6-diphenylpyridyl component, the temperature at 10% weight loss of 476–505oC, and the residue of 55–61% at 750oC in nitrogen. They also exhibited low dielectric constants of 3.11–3.38 (1 MHz), low moisture absorption in the range of 1.43–1.75%, and high transparency with an UV–vis absorption cut-off wavelength in the 350–368 nm range.
      Citation: High Performance Polymers
      PubDate: 2022-03-03T05:30:45Z
      DOI: 10.1177/09540083221080043
       
  • Studies on the effect of H+ carrier toward ionic conduction properties in
           alginate-ammonium sulfate complexes–based polymer electrolytes system

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      Authors: Nurhasniza M Khan, Noor M Norman, Ahmad S Samsudin
      Abstract: High Performance Polymers, Ahead of Print.
      The present work highlights the contribution of ammonium sulfate (NH4)2SO4 as H+ carriers in alginate-based solid polymer electrolytes (SPEs) that were successfully prepared via a solution casting technique. The Fourier transform infrared analysis revealed that molecular interactions between the host polymer and the ionic dopant complexes occurred at the wavenumbers 3700–2500 cm−1, 1800–1500 cm−1, and 1200–900 cm−1. These regions corresponded to the O-H stretching, COO− and C-O-C, moieties of alginate, respectively, which coordinated with the H+ carrier from (NH4)2SO4. At ambient temperature, the optimum ionic conductivity was obtained at 3.01 × 10−5 S cm−1 for the sample containing 10 wt.% of (NH4)2SO4. The IR-deconvolution approach shows that the ionic conduction enhancement is governed by the ionic mobility and the diffusion coefficient of H+ carriers, and the findings show that the present biopolymer, which is an alginate-based SPEs system, has an excellent possibility to be used as electrolytes for application in electrochemical devices.
      Citation: High Performance Polymers
      PubDate: 2022-02-22T03:59:42Z
      DOI: 10.1177/09540083221075320
       
  • Ag-Ag2O-TiO2@Eggshell membrane polymer nanocomposite: Conductivity and
           healing the wound infected with S. aureus studies ICSEM-2021

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      Authors: Majeed MA Ali, Talib Kh. Husain, Aisha H Ali, Ahmed R Mahmood, Mustafa A Alheety, Pramod K Singh
      Abstract: High Performance Polymers, Ahead of Print.
      The natural polymer-containing nanocomposite (Ag-Ag2O-TiO2@Eggshell membrane protein) was prepared using a rapid and efficient one-pot method. Diagnosis of this nanostructure was performed by X-ray diffraction, Energy dispersive X-ray, and SEM. The characterization results proved that this multifunctional nanocomposite was successfully synthesized within the scale of nanoscience. The conductivity of this polymer was studied in the presence of sodium iodide using acetonitrile as a solvent by complex impedance spectroscopy. The conductivity measurements prove that the highest conductivity was obtained with the highest salt concentration 1:5=Na:O. Furthermore, Ag-Ag2O-TiO2@Eggshell membrane protein nanocomposite was used to study its ability for healing the wound infected with antibiotic-resistant Staphylococcus aureus for 2 weeks. The histopathological results have shown that there is an improvement in all the indicative signs of disease with rapid development of the epidermal layer proliferating and then healing of the infected wounds rapidly.
      Citation: High Performance Polymers
      PubDate: 2022-02-14T01:27:36Z
      DOI: 10.1177/09540083221075318
       
  • Synthesis and characterization of PI gel carbonized material and its use
           in a supercapacitor

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      Authors: Juan Yu, Chengcheng Ding, Xiuwei Lv, Pei Huang
      First page: 501
      Abstract: High Performance Polymers, Ahead of Print.
      In this study, a polyimide gel material with a high spatial network structure was synthesized. The pyrolysis process increased the material’s porous structure and specific surface area to improve the specific capacitance. The effects of pyrolysis temperature on morphology, structure, thermal, mechanical, and electrochemical properties were studied. The gel material is in the frozen state of the molecular chain from the frozen state to the moving state before 400°C. At the same time, pore structure formation with a weight loss rate of 11.9% in the decomposition state at 400°C–600°C, showing the breakage of the molecular chain and the decomposition of the polymer. With the increase of carbonized temperature, the pore structure becomes more compact while the pore size becomes smaller due to the reconstruction of the polymer structure. Meanwhile, due to the stable formation of carbon skeleton and the increase of carbon amount, the PI gel carbonized material’s thermal conductivity was improved to 1.458 [math], which was 330% higher than that of pure PI gel (0.339 [math]). Furthermore, the carbonized materials exhibit a specific capacitance of 66.17 [math] and show good redox reversibility, apparent concentration polarization and good ion diffusion effect during charging and discharging, suggesting it is a promising electrode material for supercapacitors.
      Citation: High Performance Polymers
      PubDate: 2022-03-10T01:25:22Z
      DOI: 10.1177/09540083221075314
       
  • Study of the damage behavior of T800 carbon fiber/epoxy resin composites
           after low-velocity impact under thermo-oxidative aging

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      Authors: Yaoxiong Jia, Liang Xu, Qingyang Ao, Wenzheng Zhang, Xiong Han
      First page: 512
      Abstract: High Performance Polymers, Ahead of Print.
      Here, the effect of thermo-oxidative aging on domestic T800 carbon fiber/epoxy resin composites was studied using mass loss rate curves, interface morphology, infrared spectroscopy, and dynamic mechanical property analysis. The composites were subjected to thermo-oxidative aging tests after low-velocity impact. Then, the effect of environmental factors on the damage area of the composites and the compression performance after impact were investigated. The results showed that the composites underwent physical and chemical aging at 185°C. Due to the short aging time, the mass loss rate slowly increased. After aging, thermo-oxidative aging caused the matrix to crack, and the sample cracks that formed after impact expanded, and the damage area also slightly increased. The residual compressive strength of the material fluctuated due to the competing reinforcing and destructive effects of the composite during thermo-oxidative aging; however, aging had little effect on the impact damage morphology and compression failure mode. Upon extending the aging time, thermo-oxidative aging caused the tanδ peak to gradually shift to a higher temperature, and the glass transition temperature (Tg) increased.
      Citation: High Performance Polymers
      PubDate: 2022-03-03T12:57:55Z
      DOI: 10.1177/09540083211051580
       
  • Impacts of polyimide enhanced by amino-modified fluorinated graphene:
           Thermal, mechanical and tribological behaviors

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      Authors: Xiangyuan Ye, Meigui Wang
      First page: 524
      Abstract: High Performance Polymers, Ahead of Print.
      The fluorinated graphene (FG) is modified to get the amino-FG (AFG) which is applied as nanofiller of the polyimide (PI). The repulsion between the C-F bonds endows the AFG with well dispersion in polyimide (PI) matrix, and the amino groups of the AFG react with pyromellitic dianhydride to form strong physical and chemical interactions between the AFG and the PI chains. The results exhibit that the AFG obviously enhances the thermal stability, mechanical performances and wear resistant properties of the PI. When the AFG content reaches 0.5 wt%, the PI/AFG-0.5 composite shows the 35.5% higher tensile stress and 50% higher wear resistance than the PI, which are also higher than the PI/FG-0.5. The strong physical and chemical interactions between the AFG and the PI matrix enhance the interfacial compatibility of the PI/AFG composite, which is better to transfer the stress and heat, so as to enhance the mechanical and tribological properties of the PI. The worn surface changes of the PI/AFG composites indicate that the tribological mechanisms are the synergistic reaction of the abrasive wear and the fatigue wear.
      Citation: High Performance Polymers
      PubDate: 2022-03-04T04:38:01Z
      DOI: 10.1177/09540083221079507
       
  • Preparation and performance of sulfonated poly(ether ether ketone)
           membranes enhanced with ammonium ionic liquid and graphene oxide

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      Authors: Jinxun Song, Lijun Sun, Jihai Duan, Weiwen Wang, Shuguo Qu
      First page: 533
      Abstract: High Performance Polymers, Ahead of Print.
      The exploration of proton exchange membranes with excellent performance has always been under focus for improving the performance of proton exchange membrane fuel cells. In this study, novel ternary composite proton exchange membranes based on sulfonated poly(ether ether ketone) (SPEEK), triethylamine phosphate (TEAP) as the ammonium ionic liquid (AIL), and graphene oxide (GO) were prepared. The prepared membranes were characterized for their physical, physico-chemical, structural, morphological, thermal, mechanical, and electrical characteristics. The thermal stability of the SPEEK membrane was improved by the addition of GO and TEAP. GO was inserted into the composite membrane to form proton transfer channels. The amine ions in AIL formed acid–base pairs with the sulfonic acid group, whereas the oxygen-containing group on GO formed hydrogen bonds with the phosphate group. These groups interacted with each other to form a honeycomb-like structure, which anchored the AIL in the membrane and reduced its loss, providing additional sites for proton transport at higher temperatures. The proton conductivity of the SPEEK/AIL/GO-2 membrane reached 17.345 mS/cm at 120°C, which was 2.09 times higher than that of the pristine SPEEK membrane. This study provides the possibility for better preparation of proton exchange membranes used for high-temperature proton exchange membrane fuel cells.
      Citation: High Performance Polymers
      PubDate: 2022-03-05T05:38:41Z
      DOI: 10.1177/09540083211069929
       
  • The P/Si synergistic effect enduing epoxy resin with improved flame
           retardancy and outstanding mechanical properties

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      Authors: Zhuang Hou, Chuan Li, Huihuan Wang, Bolun Li, Haopeng Cai
      First page: 545
      Abstract: High Performance Polymers, Ahead of Print.
      The bisphenol F epoxy resin (DGEBF) reacted with 10-(2,5-Dihydroxyphenyl)-10H-9-oxa-10-phospha-phenantbrene-10-oxide (ODOPB) and phenyltrimethoxysilane (PTMS) to obtain a novel epoxy resin containing both phosphorus and silicon (EP-P/Si). EP-P/Si exhibited evidently improved flame retardancy, with a limited oxygen index value of 33.4% and UL-94 V-1 rating acquired. In cone calorimeter test, its peak heat release rate (PHRR), total heat release (THR), average effective heat of combustion (av-EHC), and total smoke production (TSP) were reduced by 36.0%, 19.5%,11.5%, and 7.2% compared with neat epoxy resin (EP), respectively, indicating that the P/Si synergistic effect not only improved the flame retardancy but also inhibited the smoke release. The flame retardancy mechanism was studied by analysis of char residue and pyrolysis behavior in gas phase. Scanning electron microscopy (SEM) results exhibited that EP-P/Si formed a dense and compact carbon layer acting as a barrier to inhibit further combustion. And the Fourier transform infrared (FTIR) spectra, laser Raman spectroscopy (LRS), and X-ray photoelectron spectroscopy (XPS) results indicated that it had good thermal stability. In addition, the pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) results suggested that the phosphorus-containing radicals (·PO2) that had quenching effect existed in the gas phase. While the flame retardancy got improved, EP-P/Si also exhibited excellent mechanical properties, with an improvement of 31.8%, 6.2%, and 369.7% in tensile strength, flexural strength, and impact strength compared with EP, respectively.
      Citation: High Performance Polymers
      PubDate: 2022-03-08T12:54:55Z
      DOI: 10.1177/09540083221080661
       
  • Halogen-free and phosphorus-free flame retardants endow epoxy resin with
           high flame retardancy through crosslinking strategy

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      Authors: Penglun Zheng, Rui Wang, Xiaoliang Peng, Jichang Sun, Huaiyin Liu, Junwei Li, Chuanbang Liu, Lan Jiang, Quanyi Liu, Yu Zhang
      First page: 560
      Abstract: High Performance Polymers, Ahead of Print.
      Epoxy resin (EPs) has been widely used in many fields in recent years, such as electronics, adhesives, coatings, and so on, which mainly benefiting from its excellent mechanical and chemical properties, low price and easy preparation. However, conventional EPs tend to be flammable, which significantly prevents their applications especially in high flame-resistance required areas. In this work, we introduce nitrile groups and the benzoxazine ring into the flame-retardant, followed by a simple heat treatment for a multiple cross-linking reaction in EPs. The resultant halogen/phosphorus-free and environmentally friendly network not only suppress the migration of the functional flame retardants from the substrate, but also shows much enhanced flame-retardant property, including the UL-94 rate, total heat release and reduced peak heat release rate. As a result, the thermosets can pass the UL-94 V-0 rate and reach a LOI value at 32.7% at a very low addition amount (10 wt%) of this cross-linked flame retardant.
      Citation: High Performance Polymers
      PubDate: 2022-03-14T04:37:45Z
      DOI: 10.1177/09540083221085170
       
  • The role of intramolecular and intermolecular hydrogen bonding effect for
           adenine-containing polyimide films

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      Authors: Jianghuai Hu, Chang Chen, Zheng Lu, Jingzhi Ma, Kang Cheng, Jiangbo Lv, Ke Zeng, Gang Yang
      First page: 568
      Abstract: High Performance Polymers, Ahead of Print.
      A series of adenine-containing polyimides (APIs) with intramolecular hydrogen bonding (HB) were prepared from N-(9-(4-aminophenyl)-9H-purin-6-yl)-2-methoxybenzene-1,4-diamine (b-H-MeO-APA) and commercial dianhydrides. And a systematic comparison between intramolecular and intermolecular HB effects was made using APIs with (b-H-MeO-APIs) and without (b-H-H-API) methoxy group. FTIR indicated that the occurrence of intramolecular HB originated from the side MeO group ortho to -NH-. XRD indicated that the introduction of side group MeO and corresponding intramolecular HB could destroy the orderly stacking of b-H-H-APIs. Birefringence and polarized ATR FTIR studies showed that the groups and chains in b-H-MeO-APIs films could also be simultaneously self-arranged in the in-plane direction. In contrast, the orientation degree in the in-plane direction is generally lower than that of b-H-H-APIs. The b-H-MeO-APIs films showed lower water absorption, higher Tg, and lower CTE compared to b-H-H-APIs films, which indicates that the introduction of intramolecular HB may have some positive influence in controlling water absorption, Tg, and CTE.
      Citation: High Performance Polymers
      PubDate: 2022-03-18T04:34:35Z
      DOI: 10.1177/09540083211072749
       
  • Study on vinyl crosslinking and related properties of silicon-containing
           arylacetylene resin synthesised by zinc powder catalysis

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      Authors: Sensen Dong, Fan Chen, Guihui Wang, Wei Hu, Chuanqing Zhao, Yanhong Hu, Shifeng Deng
      First page: 581
      Abstract: High Performance Polymers, Ahead of Print.
      A matrix resin poly(silicon-containing arylacetylene vinyl)s (PSAV) containing vinyl at both branch and terminal chains underwent synthesis via the zinc powder catalytic method using m-diacetylene benzene and dichloromethylvinylsilane as raw materials. Vinyl in the PSAV resin was crosslinked by the free radical initiator dibenzoyl peroxide to obtain a crosslinked network structure resin (PSAV-L). This approach sought to improve the thermal properties and other related properties of the matrix resin. A series of tests, such as rotated rheometer, FTIR, DSC, TGA, Py-GC-MS and universal testing machine, characterised processing property, curing behaviour, thermal properties and mechanical properties. The rheological curve shows that PSAV-L resin has a wide processing window (40–134.5°C), endowing the resin with excellent processing performance. Thermal curing behaviour indicates that PSAV-L resin can start curing at a lower temperature, namely, 32°C earlier than PSAV resin. TGA analysis shows that the degradation temperature at 5% weight loss (Td5) of PSAV-L resin stands at 579.4°C, 45.4°C higher than that of PSAV resin due to the fact that the crosslinking of vinyl gives PSAV-L resin a network structure. The flexural strength, flexural modulus and ILSS of the quartz fibre cloth reinforced PSAV-L resin composite (QF/PSAV-L) are 184.68 MPa, 15.50 GPa and 12.40 MPa. The PSAV-L resin exhibits the comprehensive properties of good processing performance, low curing temperature, excellent thermal performance and high mechanical properties.
      Citation: High Performance Polymers
      PubDate: 2022-03-26T12:17:47Z
      DOI: 10.1177/09540083221079704
       
  • Bio-based polybenzoxazines as an efficient coatings to protect mild steel
           surfaces from corrosion

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      Authors: Sharanya Ranganathan, Hariharan Arumugam, Balaji Krishnasamy, Subramanian Sathy Srikandan, Kumaravel Mallaiya, Muthukaruppan Alagar
      First page: 593
      Abstract: High Performance Polymers, Ahead of Print.
      New types of mono and bi-functional benzoxazine monomers were synthesized using cardanol (C) and 4-aminobenzonitrile (abn), p-phenylediamine (ppda) along with paraformaldehyde. The synthesized benzoxazine monomers structure was elucidated by 1H, 13C-NMR and FTIR spectroscopic techniques. The polymerization temperature (Tp) of C-abn and C-ppda are noticed at 280oC and 237oC, respectively. It was also noticed that bi-functional benzoxazine (C-ppda) possesses lower curing temperature than mono-functional benzoxazine (C-abn). The ring opening polymerization of benzoxazine was confirmed by FTIR spectroscopy. Thermal analyses indicate that, benzoxazine [poly(C-ppda)] possesses higher thermal stability than poly(C-abn). The surface roughness of the benzoxazine coated MS specimen was analysed by atomic force microscope. The values of water contact angles obtained for poly(C-abn) and poly(C-ppda) are 145o and 148o, respectively. It was noticed that the mild steel specimen coated with bio-based benzoxazine C-abn exhibit excellent resistance to corrosion.
      Citation: High Performance Polymers
      PubDate: 2022-03-27T12:06:53Z
      DOI: 10.1177/09540083221085163
       
  • Durable crosslinked films based on poly (arylene ether nitrile) materials
           for ultrahigh temperature applications over 300°C

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      Authors: Liang He, Lifen Tong, Xiaobo Liu
      First page: 604
      Abstract: High Performance Polymers, Ahead of Print.
      Searching for outstanding films with high temperature resistance has sparked fierce interests in the electronics industry. In this study, a novel high-temperature-resistance phthalonitrile end-capped polyarylene ether nitrile (HTR-PEN-Ph) film was fabricated via cross-linking reaction, applying two different curing programs as contrast. The fabricated HTR-PEN-Ph films were verified through FTIR, gel content test to be confirmed the cross-linking reaction. Then thermal results elucidated that PEN-Ph films treated with two-stage curing program possessed a superior glass transition temperature (Tg) in comparison with untreated one, increasing by 165–270°C. Besides, an evident increment of 5 wt.% decomposition temperature (T5%) was seen from the HTR-PEN-Ph film, which was 27–43°C higher than the untreated one. Furthermore, the HTR-PEN-Ph films exhibited notable dielectric stability over 300°C and mechanical properties after the two-stage curing program. Based on these satisfactory results, this study is of great potential to be applied in the field of industrial manufacture to fabricate a range of high-performance films.
      Citation: High Performance Polymers
      PubDate: 2022-03-27T03:28:16Z
      DOI: 10.1177/09540083221078930
       
  • Study on the tribological properties of Si3N4/polyamide-imide composites

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      Authors: Weichu Jia, Jingfei Shangguan, Feng Lang, Duxin Li, Haiyang Yang
      First page: 616
      Abstract: High Performance Polymers, Ahead of Print.
      Si3N4 whiskers were modified with triethoxysilane as a means to improve the interfacial interaction with a poly-amide imide (PAI). The Si3N4/PAI composites were prepared by in-situ polymerization as an approach to improve the friction behavior and mechanical properties in order to meet the performance needs of electrical transformers and motors in harsh environments. 4,4′-diamino diphenyl ether, m-phenylenediamine, triethylamine, trimellitic anhydride chloride, and Si3N4 whiskers were used to manufacture Si3N4/PAI composite, which was then characterized for friction and mechanical behavior. The research showed that the addition of Si3N4 whiskers improved the mechanical properties and friction properties of PAI. When the whisker content was 10 wt%, the tensile strength of the composite was 137.5 MPa, which is 15% higher than pure PAI, and the wear rate was 0.69 × 10-8 g/N·m, which is 57% lower than pure PAI, and the friction coefficient was 0.47, which was an increase of 9%. In aerospace, machinery, and transportation applications, these materials may have better performance due to their improved combination of properties.
      Citation: High Performance Polymers
      PubDate: 2022-03-28T03:10:51Z
      DOI: 10.1177/09540083221082599
       
 
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