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  Subjects -> ENGINEERING (Total: 2255 journals)
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CHEMICAL ENGINEERING (189 journals)                     

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AATCC Journal of Research     Full-text available via subscription   (Followers: 5)
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 2)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 8)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 6)
Advanced Chemical Engineering Research     Open Access   (Followers: 28)
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: 23)
Advances in Chemical Engineering and Science     Open Access   (Followers: 52)
Advances in Polymer Technology     Hybrid Journal   (Followers: 12)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 10)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 6)
Applied Petrochemical Research     Open Access   (Followers: 2)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 7)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 14)
Biofuel Research Journal     Open Access   (Followers: 4)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 7)
Catalysts     Open Access   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription  
Chemical and Engineering News     Free   (Followers: 10)
Chemical and Materials Engineering     Open Access   (Followers: 8)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 10)
Chemical and Process Engineering     Open Access   (Followers: 22)
Chemical and Process Engineering Research     Open Access   (Followers: 19)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 32)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 17)
Chemical Engineering and Science     Open Access   (Followers: 14)
Chemical Engineering Communications     Hybrid Journal   (Followers: 12)
Chemical Engineering Journal     Hybrid Journal   (Followers: 30)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 21)
Chemical Engineering Research Bulletin     Open Access   (Followers: 9)
Chemical Engineering Science     Hybrid Journal   (Followers: 21)
Chemical Geology     Hybrid Journal   (Followers: 15)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 141)
Chemical Society Reviews     Full-text available via subscription   (Followers: 38)
Chemical Technology     Open Access   (Followers: 12)
ChemInform     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Hybrid Journal   (Followers: 4)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry of Materials     Full-text available via subscription   (Followers: 159)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 4)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 10)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 1)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
CORROSION     Full-text available via subscription   (Followers: 18)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 33)
Corrosion Reviews     Hybrid Journal   (Followers: 3)
Crystal Research and Technology     Hybrid Journal   (Followers: 5)
Current Opinion in Chemical Engineering     Open Access   (Followers: 7)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription   (Followers: 1)
European Polymer Journal     Hybrid Journal   (Followers: 41)
Fibers and Polymers     Full-text available via subscription   (Followers: 4)
Fluorescent Materials     Open Access   (Followers: 1)
Focusing on Modern Food Industry     Open Access   (Followers: 2)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal   (Followers: 2)
Handbook of Powder Technology     Full-text available via subscription   (Followers: 5)
Heat Exchangers     Open Access   (Followers: 2)
High Performance Polymers     Hybrid Journal  
Hungarian Journal of Industry and Chemistry     Open Access  
Indian Chemical Engineer     Hybrid Journal   (Followers: 5)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 9)
Indonesian Journal of Chemical Science     Open Access   (Followers: 1)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 20)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 3)
Industrial Gases     Open Access  
Info Chimie Magazine     Full-text available via subscription   (Followers: 3)
International Journal of Chemical and Petroleum Sciences     Open Access   (Followers: 2)
International Journal of Chemical Engineering     Open Access   (Followers: 6)
International Journal of Chemical Reactor Engineering     Hybrid Journal   (Followers: 2)
International Journal of Chemical Technology     Open Access   (Followers: 5)
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   (Followers: 1)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 5)
International Journal of Science and Engineering     Open Access   (Followers: 4)
International Journal of Waste Resources     Open Access   (Followers: 3)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 4)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 5)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 11)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 110)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 9)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 6)
Journal of Chemical Engineering     Open Access   (Followers: 15)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 2)
Journal of Chemical Science and Technology     Open Access   (Followers: 4)
Journal of Chemical Sciences     Partially Free   (Followers: 17)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 10)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 14)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 2)
Journal of Crystallization Process and Technology     Open Access   (Followers: 7)
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 3)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access  
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 4)
Journal of Geochemical Exploration     Hybrid Journal   (Followers: 1)
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (Followers: 1)
Journal of Information Display     Hybrid Journal  
Journal of Inorganic and Organometallic Polymers and Materials     Partially Free   (Followers: 8)
Journal of Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 2)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 5)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 7)
Journal of Organic Semiconductors     Open Access   (Followers: 4)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 4)
Journal of Polymer Engineering     Hybrid Journal   (Followers: 8)
Journal of Polymer Research     Hybrid Journal   (Followers: 6)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Journal of Polymers     Open Access   (Followers: 2)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 1)
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 267)
Journal of the Bangladesh Chemical Society     Open Access  
Journal of the Brazilian Chemical Society     Open Access   (Followers: 2)
Journal of The Institution of Engineers (India) : Series E     Hybrid Journal   (Followers: 1)
Journal of the Pakistan Institute of Chemical Engineers     Open Access   (Followers: 1)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 2)
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 8)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Reaktor     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access   (Followers: 1)
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 3)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 14)
Materials Science and Applied Chemistry     Open Access  
Materials Sciences and Applied Chemistry     Full-text available via subscription  
Modern Chemistry & Applications     Open Access  
Molecular Imprinting     Open Access  
Nanocontainers     Open Access  
Nanofabrication     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 2)
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Petroleum Chemistry     Hybrid Journal   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription   (Followers: 3)
Plasma Processes and Polymers     Hybrid Journal  
Plasmas and Polymers     Hybrid Journal  
Polymer     Hybrid Journal   (Followers: 116)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Composites     Hybrid Journal   (Followers: 14)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 14)
Recyclable Catalysis     Open Access   (Followers: 1)
Research on Chemical Intermediates     Hybrid Journal  
Reviews in Chemical Engineering     Hybrid Journal   (Followers: 5)
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access  
Revista Cubana de Química     Open Access  
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Rubber Chemistry and Technology     Full-text available via subscription   (Followers: 2)
Russian Chemical Bulletin     Hybrid Journal   (Followers: 2)
Russian Journal of Applied Chemistry     Hybrid Journal   (Followers: 1)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 58)
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 2)
South African Journal of Chemistry     Open Access   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 5)
Sustainable Chemical Processes     Open Access   (Followers: 2)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 4)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 2)
Transition Metal Chemistry     Hybrid Journal   (Followers: 2)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 2)
Zeitschrift für Naturforschung B : A Journal of Chemical Sciences     Open Access   (Followers: 1)

           

Journal Cover High Performance Polymers
  [SJR: 0.378]   [H-I: 33]   [0 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0954-0083 - ISSN (Online) 1361-6412
   Published by Sage Publications Homepage  [853 journals]
  • Use of manganese dioxide as oxidant in polymerization of aniline on carbon
           black for supercapacitor performance
    • Authors: Liu, Z; Li, Z, Li, D, Yin, X, Liu, Z.
      Pages: 1105 - 1113
      Abstract: α-Manganese dioxide (MnO2) and β-MnO2 have been prepared by a simple one-step hydrothermal synthesis method. Polyaniline (PANI)/carbon black composites were synthesized in acidic medium by an in situ polymerization method using α-MnO2, β-MnO2, and ammonium peroxydisulfate (APS) as chemical oxidant. The morphology, structure, and electrochemical performances are characterized by X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, cyclic voltammetry, charge–discharge test, and electrochemical impedance measurements. The PANI/carbon black composite (PANI/C-2) prepared using β-MnO2 as oxidant shows significantly better specific capacity performance compared with those prepared using α-MnO2 and APS as oxidant. Addition of carbon black into the PANI composites prepared via the conventional polymerization method showed improved specific capacitance.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315620289
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis and characterization of organosoluble, transparent, and
           hydrophobic fluorinated polyimides derived from
           3,3'-diisopropyl-4,4'-diaminodiphenyl-4''-trifluoromethyltoluene
    • Authors: Liu, C; Pei, X, Mei, M, Chou, G, Huang, X, Wei, C.
      Pages: 1114 - 1123
      Abstract: A novel aromatic fluorinated diamine monomer, 3,3'-diisopropyl-4,4'-diaminodiphenyl-4''-trifluoromethyltoluene, was synthesized by coupling of 2-isopropylaniline and 4-(trifluoromethyl)benzaldehyde and its structure was confirmed by Fourier transform infrared spectroscopy, nuclear magnetic resonance, elemental analysis, and mass spectrometry, and then used to prepare a series of fluorinated polyimides (FPIs) by polycondensation reaction with various commercial dianhydrides via conventional one-step method. The obtained FPIs present excellent solubility in most organic solvents and enough to cast into tough and flexible films. All the FPI films show good optical transparency and light color with the cutoff wavelengths in range of 307–362 nm and the average transmittance above 86%. These polymer films also exhibit high glass transition temperature in range of 261–331°C and thermal stability with 10% weigh loss above 463°C under nitrogen atmosphere. Furthermore, they exhibit outstanding mechanical properties with tensile strengths of 65.9–94.3 MPa, elongation at break of 11.4–13.8%, Young’s modulus of 1.6–1.9 GPa, and low dielectric constants in range of 2.75–3.10 at 1 MHz as well as prominent hydrophobicity with the contact angle in the range of 87.3–93.9°.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315617230
      Issue No: Vol. 28, No. 10 (2016)
       
  • Poly(vinyl alcohol)/chitosan/montmorillonite nanocomposites for food
           packaging applications: Influence of montmorillonite content
    • Authors: Butnaru, E; Cheaburu, C. N, Yilmaz, O, Pricope, G. M, Vasile, C.
      Pages: 1124 - 1138
      Abstract: Poly(vinyl alcohol) (PVA)/chitosan (CS)/montmorillonite (C30B) materials for food packaging applications were prepared by using a noninvasive and low-cost freeze/thawing method. Cloisite 30B nanoclay content in PVA/CS gels was varied in order to establish optimum amount to obtain improved properties. The structural, morphological, rheological aspects, thermal stability, and antimicrobial activity were investigated using various techniques as Fourier transform infrared, scanning electron microscopy, rheology, thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical thermal analysis, and antibacterial tests. It was noticed that the obtained materials show an intercalated structure with specific interactions between components and nanoclay incorporation led to an increased thermal stability, mechanical properties, and excellent antimicrobial activity against Escherichia coli, Listeria monocytogenes, and Salmonella typhimurium due to synergistic action of CS and nanoclay.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315617231
      Issue No: Vol. 28, No. 10 (2016)
       
  • Preparation of aromatic polyimide particles having clear morphology by
           polymerization of salt monomers
    • Authors: Shojo, D; Sugimori, H, Yamazaki, S, Kimura, K.
      Pages: 1139 - 1150
      Abstract: Crystals of salt monomer prepared from aromatic tetracarboxylic acids and aromatic diamines were polymerized at 220°C for 3 h and at 400°C for 3 h under argon flow. Highly crystalline polyimide particles having clear morphology were obtained with good yield. They were lozenge-like crystals, long plate-like crystals, fibrillar crystals, and spherical aggregates of plate-like crystals. The crystals of salt monomer were polymerized in the solid-state with maintaining the morphology, and therefore the morphology of the polyimide particles were the same to that of the crystals of the corresponding salt monomer. Molecular orientation in the lozenge-shaped crystal of poly(p-phenylene pyromelliteimide) was examined by selected area electron diffraction, and the polymer molecules aligned perpendicular to the plate plane which was the direction of the thickness. Obtained particles possessed good thermal stability.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315619998
      Issue No: Vol. 28, No. 10 (2016)
       
  • Advanced studies on synthesis and cure reaction of fluorinated epoxy resin
    • Authors: Damian, C. M; Vulcan, M. A, Zaharia, A, Zaharia, C, Vasile, E, Iovu, H.
      Pages: 1151 - 1160
      Abstract: Fluorinated epoxy resins (FERs) were extensively studied for applications in electronic packaging, optical waveguides, and antifouling coatings. This research focuses on the synthesis and characterization of FER following a polycondensation reaction between fluorinated bisphenol and epichlorohydrin. Cure reaction was monitored using dispersive Raman spectroscopy and by calculation of the oxirane groups conversion. After one short postcuring stage, the decomposition temperatures of fluoroepoxy showed increased values with 28–35°C for the samples cured at 50°C. The resultant materials showed excellent fracture morphology, while the presence of fluorine was revealed by energy-dispersive X-ray and X-ray photoelectron spectroscopic techniques. Hydrophobic surface was evidenced through the surface energy resulted from contact angle measurements.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315620288
      Issue No: Vol. 28, No. 10 (2016)
       
  • Self-cured phthalonitrile resin via multistage polymerization mediated by
           allyl and benzoxazine functional groups
    • Authors: Xu, M; Jia, K, Liu, X.
      Pages: 1161 - 1171
      Abstract: Self-curing allyl-functional phthalonitriles-containing benzoxazine (DABA-ph) has been designed and synthesized. These formed a resin through a curing process involving the sequential polymerization of allyl moieties, ring-opening polymerization of oxazine rings, and ring-forming polymerization of nitrile groups. The introduction of allyl moieties was found to improve the processability as the process started at a lower temperature of 160–200°C than is needed for related resins. After self-curing, the resins exhibited high cross-linking degrees and excellent thermal stabilities. The glass transition temperature (T g) was increased compared to similar resins to 380°C with good thermal stability (5% weight loss temperature > 490°C). These outstanding properties suggest the DABA-ph polymers are suitable candidates as matrices for high-performance composites.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315620290
      Issue No: Vol. 28, No. 10 (2016)
       
  • A study of co-reaction mechanism and properties of propenyl-substituted
           monomer/bismaleimide system
    • Authors: Qu, C; Liu, P, Liu, C, Wang, D, Zhang, Y, Xiao, W, Hou, X.
      Pages: 1172 - 1182
      Abstract: A practical modifier, 4,4'-bis[2-(1-propenyl)phenoxy]benzophenone (MT), has been synthesized and copolymerized with 4,4'-bismaleimidodiphenylmethyene (4,4'-BMI) to yield a low-temperature cure bismaleimide resin. Structural information of MT was obtained using Fourier transform infrared spectroscopy and nuclear magnetic resonance (proton and carbon) spectroscopy, elemental, and mass spectrometry analyses. The differential scanning calorimetric curve of the MT/4,4'-BMI system shows two exothermic peaks at 164°C and 210°C, respectively. This value was compared with other polymerization reactions involving diallyl bisphenol A (DP) and diallyl bismaleimide (DBMI), with an exothermic peak at around 257°C. Unlike normal bismaleimide resins with DP postcured at 250°C for about 4–8 h, the MT/4,4'-BMI resin was cured at 230°C for a total of 6 h (i.e. MBMI-230) or at 200°C for 6 h (i.e. MBMI-200). Furthermore, the resins exhibit high thermal resistance, excellent mechanical properties, and exceptionally low dielectric loss. For MBMI-230 and MBMI-200, the dielectric loss values are all in the range of 0.0024–0.0054 from 7 GHz to 18 GHz and feature excellent thermal stabilities (5% weight loss temperature (T d5) > 415°C under nitrogen atmosphere) and thermo-oxidative stabilities (T d5 > 425°C in air atmosphere). Additionally, the cured resins also display a high bending modulus (>3.2 GPa) at room temperature and an excellent mechanical stability at high temperature.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315621121
      Issue No: Vol. 28, No. 10 (2016)
       
  • A WORM type polymer electrical memory based on polyethersulfone with
           carbazole derivatives
    • Authors: Fang, J; Wang, Q, Yue, X, Wang, G, Jiang, Z.
      Pages: 1183 - 1191
      Abstract: A series of high-performance polyethersulfone, which had pendent carbazole moieties (Cz-PES 1–3), have been designed and successfully synthesized for an application in a write-once read-many type memory device as the active polymer layer. The memory performance can be tuned by changing the substituent in the Cz derivatives units. Cz-PES 3 with excellent thermal properties (Tg = 185°C and Td = 378°C) exhibits the best memory performance. For Cz-PES 3-based device indium tin oxide/Cz-PES 3/aluminum, the turn-on voltage is 2.5 V and the ON/OFF current ratio is higher than 106. Moreover, the data can be maintained for longer than 3 x 105 s once written and can be read for more than 450 cycles under a reading voltage of 1.0 V at ambient conditions. Thus Cz-PES 3 can serve as an excellent memory material in the data storage field of next generation.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315621122
      Issue No: Vol. 28, No. 10 (2016)
       
  • Effect of lignin-cellulose nanofibrils on the hydrophilicity and
           mechanical properties of polyethersulfone ultrafiltration membranes
    • Authors: Ding, Z; Zhong, L, Wang, X, Zhang, L.
      Pages: 1192 - 1200
      Abstract: In the present research, novel polyethersulfone (PES)/lignin–cellulose nanofibril (LCN) blend ultrafiltration membranes with high hydrophilicity and noticeable mechanical properties were prepared via immersion precipitation method. LCN was employed to improve the hydrophilicity and mechanical properties of pure PES ultrafiltration membranes. Transmission electron microscopy and Fourier transform infrared spectroscopy (FTIR) were used to characterize the structure of the LCN. The performance of blend ultrafiltration membranes were characterized in terms of FTIR, thermogravimetric analysis, scanning electron microscopy, pure water flux (PWF), bovine serum albumin retention, water contact angle, surface energy, and mechanical properties. With the increase in content of LCN from 0 wt% to 1.2 wt%, the PWF improved from 322.8 L m–2 h–1 to 692.3 L m–2 h–1 and the tensile strength increased from 4.8 MPa to 7.2 MPa. It was revealed that the addition of LCN could improve the hydrophilicity and mechanical properties of pure PES ultrafiltration membrane.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315621611
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis and properties of polyimides containing tetraphenylnaphthalene
           units
    • Authors: Morikawa, A; Karube, C, Sakaki, Y.
      Pages: 1201 - 1209
      Abstract: Aromatic polyimides (PI1x) with a tetraphenylnaphthalene unit between ether linkages were synthesized from 1,4-bis[4-(aminophenoxy)phenyl]-2,3-diphenylnaphthalene (1) and various tetracarboxylic dianhydrides by a conventional two-step procedure that included ring-opening polymerization in N-methyl-2-pyrrolidone and subsequent thermal cyclic dehydration. PI1x were characterized by X-ray diffraction, differential scanning calorimetry, thermogravimetry, and dynamic mechanical analysis. PI1x had glass transition temperatures in the range of 270–315°C and all PI1x were amorphous. The structure–property relationships of these PIs were examined and compared with those of polyimides (PI2x) from 4,4'-bis(4-aminophenoxy)biphenyl (2) and polyimides (PI3x) from 1,4-bis(4-aminophenyl)-2,3-diphenylnaphthalene (3). Water absorption and dielectric constants () of the PIs were also compared and discussed on the basis of imide content per repeating unit.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315622246
      Issue No: Vol. 28, No. 10 (2016)
       
  • Effects of molecular weight on the dynamic mechanical properties and
           interfacial properties of carbon fiber fabric-reinforced polyetherketone
           cardo composites
    • Authors: Ma, Y; Bi, Y, Zhang, X, Wang, D, Dang, G, Zhou, H, Chen, C.
      Pages: 1210 - 1217
      Abstract: It’s a long-standing task to explore the toughening effect of fiber-reinforced thermoplastic composites, which could be used to produce new materials demanded by the aerospace field. In this work, we investigated the effects of the molecular weight of a thermoplastic resin, polyetherketone cardo (PEK-c), on the thermal, mechanical, and interfacial properties of the composite. Carbon fiber fabrics reinforced with PEK-c composite laminates were prepared by solution-processed prepreg and hot press molding. Scanning electron microscopic results showed that the fibers were distributed uniformly in the resin, with no visible flaws detected. The results of the dynamic mechanical analysis revealed that, according to the lower mobility of the polymer chain, the glass transition temperature of composite laminates increased with the increase in molecular weight. However, the tan values showed a lower peak value with a higher molecular weight due to the improved interfacial property between the resin and the fiber. The results on interlaminar shear strength also indicate that composites with resins of higher molecular weight have better interfacial adhesion. These results are closely interrelated with and contribute to our overall understanding of the effects of molecular weight on the properties of CFRP composites.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315622260
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis and characterization of cardo-based phosphorous-containing
           flame-retardant aromatic polyesters
    • Authors: Latha, G; Natarajan, M, Murugavel, S.
      Pages: 1218 - 1227
      Abstract: Phosphorous-containing cardo polyesters were synthesized by interfacial polycondensation of phenylphosphonic dichloride with various bisphenols using a phase-transfer catalyst at ambient temperature. The structure of the synthesized polymers was confirmed using Fourier transform infrared and proton, carbon 13, and phosphorous 31 nuclear magnetic resonance spectroscopic techniques. The thermal properties of the polymers were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry under nitrogen atmosphere. All the polyesters showed high thermal stability, the maximum decomposition temperature being in the range of 475–523°C. The TGA data showed that all the synthesized phosphorous-containing polyesters produce high char yield at 700°C due to the presence of phosphorous atom in the polymer chain and hence have good flame-retardant properties. The synthesized phosphorus-containing polyesters have tensile strength in the range of 38.2–48 MPa, and the percentage of elongation at breaks of 3.3–16.8. The flame retardancy of all synthesized polymers was investigated by limiting oxygen index (LOI) and vertical burning (UL-94) tests. The results showed that the synthesized polymers have excellent flame retardancy, that is, the polymer samples achieved an increased UL-94 rating and the LOI values were in the range of 28.5–34. Broido model has been used to study the thermal degradation kinetic parameters.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315623351
      Issue No: Vol. 28, No. 10 (2016)
       
  • Poly(4,4'-oxydiphenylene-pyromellitimide) loaded by NH2-functionalized
           silica: Optical and thermal behavior of new polyimide-based nanocomposites
           
    • Authors: Behniafar, H; Yazdi, M, Farshad, S, Malekshahinezhad, K.
      Pages: 1228 - 1234
      Abstract: In this research, silica nanopowder is surface modified via a facile urethanation reaction to obtain silicon dioxide (SiO2) nanoparticles possessing amine (NH2)-functionalized organic moieties. Poly(4,4'-oxydiphenylene-pyromellitimide) as one of the most widely used polyimides (PIs) is then uniformly loaded by these organically modified nanoparticles (approximately 5% by weight) during its synthesis process at the thermal cyclodehydration stage of the corresponding poly(amic acid) precursor. Amine-functionalized SiO2 nanoparticles (SiO2~NH2) and the resulting PI-based nanocomposites (PI/SiO2 and PI/SiO2~NH2) are thoroughly characterized by Fourier transform infrared spectroscopy, diffuse reflectance ultraviolet–visible, X-ray diffraction, and scanning electron microscopy. Thermogravimetric analyses/derivative thermogravimetry thermograms obviously show that about 22% (by weight) of the nano-SiO2 particles is formed by organic moieties. Moreover, the thermostability order is found to be PI/SiO2 > PI/SiO2~NH2 > neat PI. The nanocomposite PI/SiO2~NH2 shows a two-step thermal decomposition pattern; the first step is due to the scission of the organic part from the nanoparticles loaded. According to the slope changes of the differential thermal analyses curves, the first-order phase transition could be found at the thermal range of 300–400°C. This transition, however, is not so clear for PI/SiO2 and PI/SiO2~NH2 nanocomposites due to the interaction of nano-SiO2 particles with PI matrix.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315623352
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis, characterization, and thermal properties of benzoxazine
           monomers containing allyl groups
    • Authors: Wang, Y; Kou, K, Li, Z, Wu, G, Zhang, Y, Feng, A.
      Pages: 1235 - 1245
      Abstract: The polymerization mechanism of allyl-functional benzoxazine (Bz) monomers is reported in this article. Following the traditional route of Bz synthesis, a series of monofunctional Bz monomers were synthesized via allylamine and amine condensation reaction with 2,2'-diallyl bisphenol-A and paraformaldehyde. Resulting chemical structures of the synthesized monomers were confirmed by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance analyses. The polymerization behavior of the prepared allyl-functional monomers was studied using differential scanning calorimetry and FTIR. Three reactions were observed in the curing process: polymerization reaction of N-allyl groups in the oxazine ring, ring-opening polymerization of Bz, and polymerization reaction of allyl groups in benzene. Compared to a typical polybenzoxazine (PBz), higher cross-linking density in PBz-allyl-2 leads to a higher glass transition temperature and 5% weight loss temperature, which indicates improved thermal stability in PBz-allyl-2 as well as superior thermal conductivity compared to 2,2'-bis(3-phenyl-3,4-dihydro-2H-1,3-benzoxazinyl)propane. Data on dielectric properties also show that PBz-allyl-2 outperforms typical PBzs. This work focuses on the manipulation of Bz monomer structures to alter their ring-opening polymerization mechanism, as well as cross-linking, in order to derive a PBz with improved properties.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315623353
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis and gas transport properties of new polynorbornene
           dicarboximides bearing trifluoromethyl isomer moieties
    • Authors: Cruz-Morales, J. A; Vargas, J, Santiago, A. A, Vasquez-Garcia, S. R, Tlenkopatchev, M. A, de Lys, T, Lopez-Gonzalez, M.
      Pages: 1246 - 1262
      Abstract: This work reports on the synthesis and ring-opening metathesis polymerization (ROMP) of new structural isomers based on norbornene dicarboximides bearing trifluoromethyl moieties, specifically, N-2-trifluoromethylphenyl-exo-endo-norbornene-5,6-dicarboximide (2a) and N-3-trifluoromethylphenyl-exo-endo-norbornene-5,6-dicarboximide (2b) using tricyclohexylphosphine [1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene][benzylidene] ruthenium dichloride (I), bis(tricyclohexylphosphine) benzylidene ruthenium (IV) dichloride (II), and bis(tricyclohexylphosphine) p-fluorophenylvinylidene ruthenium (II) dichloride (III). It is observed that the –CF3 moiety attached to the ortho position of the aromatic ring increases the thermal and mechanical properties of the polymer, whereas the meta substitution has the opposite effect. A comparative study of gas transport in membranes based on these fluorinated polynorbornenes showed that the –CF3 ortho substitution increases the permeability of the polymer membrane as a consequence of the increase of both the gas solubility and the gas diffusion. In contrast, the gas permeability coefficients of the meta-substituted polymer membrane are rather similar to those of the non-fluorinated one attributed to a lower fractional free volume. The meta-substituted polymer membrane besides showing the largest permselectivity coefficients of all the isomers studied here was also found to have one of the largest permselectivity coefficients reported to date for separating hydrogen/propylene in glassy polynorbornene dicarboximides.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315624954
      Issue No: Vol. 28, No. 10 (2016)
       
  • Synthesis of organosoluble and transparent phenolphthalein-based cardo
           poly(ether sulfone imide)s via aromatic nucleophilic substitution
           polymerization
    • Authors: Li, L; Liu, J, Chen, G, Xu, L, Mushtaq, N, Sidra, L. R, Wang, R, Fang, X.
      Pages: 1263 - 1271
      Abstract: A series of cardo poly(ether sulfone imide)s (PESI-C) containing bulky phthalide groups were prepared via aromatic nucleophilic substitution reaction of phenolphthalein with 4,4'-difluorodiphenyl sulfone and 4,4'-bis(4-fluorophthalimido)diphenyl ether (BFPI). The glass transition temperatures and 5% weight loss temperatures in nitrogen of the resulting PESI-C increased from 258°C to 278°C and from 468°C to 495°C with increasing the content of imide moiety in the polymer chain, respectively. These PESI-C films were transparent and essentially colorless and exhibited good mechanical properties with tensile strengths of 91–124 MPa, elongations at break of 6.9–12.8%, and tensile moduli of 2.2–2.8 GPa, respectively. It is noted that the tensile strengths, elongations at break, and tensile moduli of PESI-C also increased with increasing the content of BFPI in the copolymerization, indicating that the properties could be adjusted by controlling the ratio of BFPI and 4,4'-difluorodiphenyl sulfone.
      PubDate: 2016-11-24T20:07:13-08:00
      DOI: 10.1177/0954008315624955
      Issue No: Vol. 28, No. 10 (2016)
       
 
 
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