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  Subjects -> ENGINEERING (Total: 2244 journals)
    - CHEMICAL ENGINEERING (187 journals)
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CHEMICAL ENGINEERING (187 journals)                     

Showing 1 - 0 of 0 Journals sorted alphabetically
AATCC Journal of Research     Full-text available via subscription   (Followers: 3)
ACS Sustainable Chemistry & Engineering     Hybrid Journal  
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 7)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 12)
Advanced Powder Technology     Hybrid Journal   (Followers: 12)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 4)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 21)
Advances in Chemical Engineering and Science     Open Access   (Followers: 33)
Advances in Polymer Technology     Hybrid Journal   (Followers: 12)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
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: 8)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 5)
Applied Petrochemical Research     Open Access   (Followers: 2)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 7)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 12)
Biofuel Research Journal     Open Access   (Followers: 3)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 9)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 7)
Catalysts     Open Access   (Followers: 5)
ChemBioEng Reviews     Full-text available via subscription  
Chemical and Engineering News     Free   (Followers: 10)
Chemical and Materials Engineering     Open Access   (Followers: 3)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 9)
Chemical and Process Engineering     Open Access   (Followers: 5)
Chemical and Process Engineering Research     Open Access   (Followers: 7)
Chemical Communications     Full-text available via subscription   (Followers: 62)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 30)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 14)
Chemical Engineering and Science     Open Access   (Followers: 5)
Chemical Engineering Communications     Hybrid Journal   (Followers: 11)
Chemical Engineering Journal     Hybrid Journal   (Followers: 21)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 20)
Chemical Engineering Research Bulletin     Open Access   (Followers: 2)
Chemical Engineering Science     Hybrid Journal   (Followers: 19)
Chemical Geology     Hybrid Journal   (Followers: 13)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 127)
Chemical Society Reviews     Full-text available via subscription   (Followers: 38)
Chemical Technology     Open Access   (Followers: 5)
ChemInform     Hybrid Journal   (Followers: 4)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 135)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
ChemSusChem     Hybrid Journal   (Followers: 6)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
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: 9)
CORROSION     Full-text available via subscription   (Followers: 19)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 35)
Corrosion Reviews     Hybrid Journal   (Followers: 3)
Crystal Research and Technology     Hybrid Journal   (Followers: 5)
Current Opinion in Chemical Engineering     Open Access   (Followers: 4)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 40)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
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: 3)
Heat Exchangers     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal  
Hungarian Journal of Industry and Chemistry     Open Access  
Indian Chemical Engineer     Hybrid Journal   (Followers: 4)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 9)
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)
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: 2)
International Journal of Industrial Chemistry     Open Access  
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: 10)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 102)
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: 10)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 5)
Journal of Chemical Engineering     Open Access   (Followers: 6)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 1)
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: 13)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 1)
Journal of Coatings     Open Access   (Followers: 4)
Journal of Crystallization Process and Technology     Open Access   (Followers: 6)
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 Fuels     Open Access  
Journal of Geochemical Exploration     Hybrid Journal  
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: 6)
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 Ocean University of China (English Edition)     Hybrid Journal  
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 Powder Technology     Open Access   (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: 223)
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 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 Sciences and Applied Chemistry     Full-text available via subscription  
Molecular Imprinting     Open Access  
MRS Communications     Hybrid Journal  
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: 83)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Composites     Hybrid Journal   (Followers: 13)
Powder Technology     Hybrid Journal   (Followers: 12)
Recyclable Catalysis     Open Access   (Followers: 1)
Research on Chemical Intermediates     Hybrid Journal  
Reviews in Chemical Engineering     Hybrid Journal   (Followers: 5)
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: 54)
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 2)
South African Journal of Chemistry     Full-text available via subscription   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 5)
Sustainable Chemical Processes     Open Access   (Followers: 1)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 3)
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: 1)
Zeitschrift für Naturforschung B : A Journal of Chemical Sciences     Open Access   (Followers: 1)

           

Journal Cover High Performance Polymers
  [SJR: 0.374]   [H-I: 29]   [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  [839 journals]
  • The evolution of structure and properties for copolyamide
           fibers-containing benzimidazole units during the decomplexation of
           hydrogen chloride
    • Authors: Li, K; Luo, L, Huang, J, Ma, X, Wang, H, Feng, Y, Liu, X.
      Pages: 381 - 389
      Abstract: A diamine monomer 2-(4-aminophenyl)-5-aminobenzimidazole (PABZ) was introduced to modify poly(p-phenylene terephthalamide) by copolymerization, and corresponding aromatic copolyamide fibers were prepared by wet spinning. Thermogravimetric analysis showed that the benzimidazole units of the as-spun copolyamide fibers can complex with hydrogen chloride (HCl) to form protonated benzimidazole units, and the decomplexation takes place above 280°C. It is interesting that the crystal orientation, crystallite size, and tensile strength increase significantly during the decomplexation. Fourier transform infrared spectroscopy proved that the decomplexation leads to the release of the electron donor C=N, which can form hydrogen bonding with NH in the PABZ unit. After removing HCl, the copolyamide fibers exhibit better planarity and stronger – conjugation between benzimidazole and benzene rings, which is conducive to the formation of – stacking. Thus, we suggest that the newly formed hydrogen bonding and the enhanced – stacking induce the closely packing and spontaneous orientation of the macromolecular chains, which lead to the sharp improvement of the tensile strength.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315583704
      Issue No: Vol. 28, No. 4 (2016)
       
  • Study of thermal decomposition kinetics for polyimides based on
           2,6-bis(4-aminophenyl)-4-(4-(4-aminophenoxy) phenyl) pyridine
    • Authors: Zhuo, L; Kou, K, Bai, Y, Wang, Y, Wu, G.
      Pages: 390 - 400
      Abstract: This study reports on the preparation and thermal decomposition kinetics of a polyimide (PI) with phthalimide pendant (PI-1) and an analogous hyperbranched PI (PI-2). PI-1 was synthesized from 2,6-bis(4-aminophenyl)-4-(4-(4-aminophenoxy) phenyl) pyridine (BAAP) and 4,4'-(hexa-fluoroisopropylidene) diphthalic anhydride using a simple method with BAAP terminated by phthalic anhydride. The morphology of the PI structures was examined using X-ray diffraction. The thermal decomposition processes of the PIs were then studied according to a two-stage method using thermogravimetric analysis. The results indicated that both PIs exhibited excellent thermal stability, with a decomposition pattern of 5% mass loss beyond 508°C and 10% beyond 529°C. The two PIs exhibited similar levels of thermal stability in the first decomposition stage, but PI-1 exhibited higher stability in the second stage. The results indicate that PIs into which phthalimide pendants have been introduced retain their thermal stability in the first stage of decomposition and demonstrate enhanced thermal stability in the second stage.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315583705
      Issue No: Vol. 28, No. 4 (2016)
       
  • Enhanced high-open circuit voltage in fluorinated benzoselenadiazole-based
           polymer solar cells
    • Authors: Wang, S.-Y; Liu, Z.-Y, Ai, L, Islam, A, Peng, R.-X, Zhang, J.-F, Ge, Z.-Y.
      Pages: 401 - 410
      Abstract: Three new donor–acceptor copolymers (PCDTBSe, PCDTFBSe, and PCDTDFBSe) were designed and synthesized with 2,7-carbazole as the donor (D) unit and benzoselenadiazole (BSe), monofluoro-benzoselenadiazole, and difluoro-benzoselenadiazole as the acceptor (A) units, respectively. The structure–property relationship of these polymers was elucidated in bulk heterojunction polymer solar cells. All the polymers were fully characterized and exhibited good thermal stability and broad absorption. The highest occupied molecular orbitals (HOMOs) of the PCDTBSe (–5.29 eV), PCDTFBSe (–5.32 eV), and PCDTDFBSe (–5.35 eV) were decreased by incorporating fluorine atoms on the polymer backbone. The low-lying HOMO energy level suggested that the polymers would exhibit high open circuit voltage (V OC) when blended with fullerene as the electron acceptor. Solar cell based on PCDTFBSe displayed a power conversion efficiency of 1.09% with a short-circuit current density (J SC) of 4.29 mA cm–2, a V OC of 0.78 V, and a fill factor (FF) of 32.51%, under the illumination of AM1.5G, 100 mW cm–2.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315584627
      Issue No: Vol. 28, No. 4 (2016)
       
  • Effect of air plasma treatment on interfacial shear strength of carbon
           fiber-reinforced polyphenylene sulfide
    • Authors: Xu, D; Liu, B, Zhang, G, Long, S, Wang, X, Yang, J.
      Pages: 411 - 424
      Abstract: Plasma treatment, an environmentally safe method, was applied for surface modification of carbon fibers (CFs) and polyphenylene sulfide (PPS) fibers. The morphology, crystallization property, thermal stability, and chemical properties of CF/PPS composites were determined, respectively, by scanning electron microscopy, differential scanning calorimetry, thermogravimetry analysis, and X-ray photoelectron spectroscopy. Interfacial micromechanical performance of CF/PPS composites was investigated by microbond test. The influence of plasma treatment on the apparent interfacial shear strength ( app) of CF/PPS micro-composite was systematically evaluated. The plasma treatment of CF reduced the app of the micro-composite by 13.7% and that of CFs and PPS fibers by 3.4%. However, the plasma-treated PPS fibers increased the app of the micro-composite by 17.1%. The present study demonstrates that matching of polarity between CF and the resin plays a great role in reinforcement of interfacial property.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315585012
      Issue No: Vol. 28, No. 4 (2016)
       
  • Studies on graphene oxide-reinforced polybenzoxazine nanocomposites
    • Authors: Revathi, R; Prabunathan, P, Kumar, M, Alagar, M.
      Pages: 425 - 435
      Abstract: In the present work, different weight percentages (1, 3, and 5 wt%) of benzoxazine-functionalized graphene oxide (FGO) were reinforced with polybenzoxazine (PBZ) matrix by means of ring-opening polymerization. The resulting nanocomposites were characterized for their thermal, mechanical, dielectric, and optical properties using different analytical techniques. From the results of these studies, it was observed that the 5 wt% FGO-reinforced PBZ composite shows an improved glass transition temperature, thermal stability, and dielectric constant to the extent of 18%, 39%, and 197%, respectively, when compared with those of neat PBZ matrix. Furthermore, 5 wt% FGO-reinforced PBZ composite also exhibits an enhanced ultraviolet shielding efficiency (88%), with improved tensile strength (52%) compared with those of neat PBZ matrix. The enhanced properties may be due to homogeneous and uniform distribution of FGO into the PBZ matrix, which was confirmed from scanning electron microscopic and high-resolution transmission electron microscopic images. Data obtained from these studies indicate that the developed nanocomposites with high dielectric constant can be used in the form of coatings, sealants, and encapsulates for high-performance dielectric as well as antistatic applications.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315585013
      Issue No: Vol. 28, No. 4 (2016)
       
  • Synthesis and properties of novel 9,9-diphenyl xanthene-based poly(aryl
           ether ketone)s with methyl substituents
    • Authors: Guo, D.-D; Jiang, J.-W, Yu, L.-M, Liu, X.-L, Sheng, S.-R.
      Pages: 436 - 444
      Abstract: A new bisphenol, 9,9-bis(4-hydroxy-3-methylphenyl)xanthene, was synthesized via a one-pot, two-step synthetic procedure in good yield and used for polymerization with difluorinated aromatic ketones in tetramethylene sulfone in the presence of anhydrous potassium carbonate to form several aromatic poly(ether ketone)s (PEKs) with 9,9-diphenylxanthene moieties and methyl substituents. The newly synthesized high-molecular-weight PEKs having number-average molecular weights in the range of 20,500–25,600 g mol–1 with the polydispersity index ranging from 1.9 to 2.1 were all amorphous and showed high glass transition temperatures in the range of 194–229.8°C, and the temperatures at the 5% weight loss were in the range of 420–445°C with char yields above 60% at 600°C under nitrogen atmosphere. All new PEKs are soluble in polar aprotic solvents, such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, chloroform, pyridine, m-cresol, and tetrahydrofuran, and could form transparent, strong, and flexible films with tensile strengths of 66–74 MPa, Young’s moduli of 2.47–2.77 GPa, and elongations at break of 8–14%. In addition, these polymers had high transparency with an ultraviolet–visible absorption cutoff wavelength in the 352–356 nm range and low moisture absorption in the range of 0.41–0.56%.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315585014
      Issue No: Vol. 28, No. 4 (2016)
       
  • Preparing copolyester-titanium dioxide nanocomposites with low melting
           point via in situ hydrolysis, catalysis and esterification process
    • Authors: Zhang, G; Ke, Y, Song, Y, Lu, S, Wang, Z.
      Pages: 445 - 452
      Abstract: Copolyester (CP)-titanium dioxide (TiO2) (CPT) nanocomposites with low melting point were synthesized by esterification of terephthalic acid, isophthalic acid, ethylene glycol and 1,4-butanediol monomers in the presence of tetrabutyl orthotitanate (TBOT). TBOT hydrolysis caused the TiO2 nanoparticles to act as catalysts for polymerization. Transmission electron micrographs showed that the TiO2 nanoparticles with the content ranging from 0.2 wt% to 0.4 wt% were well dispersed in the copolyester matrix. The thermal properties of the nanocomposites were assessed by differential scanning calorimetry. The melting point of CPT nanocomposite with 1.2 wt% TiO2 was 201.9°C, significantly lower than that of pure polyethylene terephthalate (above 260°C). Therefore, the obtained CPT nanocomposites with low melting point are potentially better for industrial applications than the commercial product.
      PubDate: 2016-04-19T04:16:25-07:00
      DOI: 10.1177/0954008315587123
      Issue No: Vol. 28, No. 4 (2016)
       
  • Preparation and properties of amine-functionalized reduced graphene
           oxide/waterborne polyurethane nanocomposites
    • Authors: Wu, S; Shi, T, Zhang, L.
      Pages: 453 - 465
      Abstract: Amine-functionalized reduced graphene oxide (NH2-RGO), with primary amine (—NH2) groups linked onto surfaces by toluene-2,4-diisocynate), was successfully synthesized. Subsequently, the as-prepared NH2-RGO nanoplatelets were covalently incorporated into a waterborne polyurethane (WPU) matrix to fabricate NH2-RGO/WPU nanocomposites by the reaction of —NH2 groups with the isocyanate-terminated polyurethane prepolymer. Electron microscopic observations confirmed that the NH2-RGO nanoplatelets were homogenously dispersed in the WPU matrix. The NH2-RGO/WPU nanocomposites exhibited a significant improvement in their mechanical and thermal properties. The tensile strength and storage modulus of the nanocomposites increased by 73% and 973%, respectively, with the addition of 1.0 wt% NH2-RGO. The thermal degradation temperature was enhanced by about 40°C compared with the neat WPU. Meanwhile, the thermal conductivity increased by about 258%.
      PubDate: 2016-04-19T04:16:26-07:00
      DOI: 10.1177/0954008315587124
      Issue No: Vol. 28, No. 4 (2016)
       
  • Studies on structurally different diamines and bisphenol benzoxazines:
           Synthesis and curing kinetics
    • Authors: Rishwana, S. S; Pitchaimari, G, Vijayakumar, C. T.
      Pages: 466 - 478
      Abstract: The compounds resorcinolbisbenzoxazine, quinolbisbenzoxazine, p-phenylene diaminebisbenzoxazine, and m-phenylenediaminebisbenzoxazine are prepared. The structural and thermal characterizations of the materials are done using Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR) and 13C NMR, and differential scanning calorimetry. Both FTIR and NMR studies reveal the presence of oxazine rings in the synthesized monomers. The curing exotherm of these bisbenzoxazines is much influenced by the nature of the aromatic unit present in the chosen compound and also on the type of the benzoxazine unit in the system. Curing kinetics is performed using Flynn–Wall–Ozawa, Vyazovkin, and Friedman methods. The apparent activation energies (Ea-C) for the thermal curing of the synthesized monomers varied and are dependent on the nature and the position of the functional groups present in the compound. The highest Ea-C values are noted for the compounds having the functionalizations being para oriented.
      PubDate: 2016-04-19T04:16:26-07:00
      DOI: 10.1177/0954008315587125
      Issue No: Vol. 28, No. 4 (2016)
       
  • High-strain-rate compression behavior and failure mechanism of 3D MWK
           carbon/epoxy composites
    • Authors: Li, D.-s; Ge, D.-y, Jiang, N, Jiang, L.
      Pages: 479 - 491
      Abstract: The high-strain-rate compression experiments were performed on the three-dimensional multiaxial warp knitted (3D MWK) carbon/epoxy composites with different fiber architectures at room and elevated temperature using a split Hopkinson pressure bar apparatus. Macro-fracture and scanning electron microscope (SEM) micrographs were examined to understand the deformation and failure mechanism. The results show that 3D MWK carbon/epoxy composites have excellent high-strain-rate compression properties. The dynamic properties increase significantly with the strain rate and the composites show a high-strain-rate sensitivity. Meanwhile, composites with multidirectional symmetric fiber architecture have higher dynamic properties. Moreover, the composites show temperature sensitivity at high strain rates and the dynamic strength decreases significantly. The results also indicate the composites take on more serious damage and failure with the increase of strain rate. The failure of material with [0°/0°/0°/0°] behaves as binding fibers fracture in shear, 0° fibers tearing, overall expansion, and multiple 45° angle shear fracture, while the material with [0°/90°/+45°/–45°] is mainly interlaminar delaminating, and the local fibers tearing and shear on different fiber layers. In addition, with the increase of temperature, the composite shows less fracture and becomes more softened and plastic. The damages of matrix falling off, plasticity, and fiber/matrix interface debonding increase significantly.
      PubDate: 2016-04-19T04:16:26-07:00
      DOI: 10.1177/0954008315587126
      Issue No: Vol. 28, No. 4 (2016)
       
  • The influence of different length of symmetrical alkyl side chains on the
           dielectric constant of soluble poly(aryl ether ketone) copolymers
    • Authors: Huo, P; Ba, J, Zhang, S, Zhang, X, Geng, Z, Liu, Y, Wang, G.
      Pages: 492 - 501
      Abstract: A series of novel amorphous poly(aryl ether ketone) random copolymers containing rigid bulky pendant adamantyl groups and different length symmetrical alkyl side chains were synthesized and characterized. The chemical structures of the copolymers were confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopies. The influence of different length of symmetrical alkyl side chains on the dielectric constant, thermal property, mechanical property, and water uptake was investigated. The result shows that the dielectric constants ( ) of the copolymer films ( = 2.72–2.90 at 1 MHz) are remarkably lower than commercial poly(ether ether ketone) ( = 3.27 at 1 MHz), and with the increasing length of symmetrical alkyl side chains of the copolymers, the dielectric constants of the copolymers decrease. The flexibility of the copolymer films exhibits a positive trend as the length of symmetrical alkyl side chains increases. Simultaneously, the copolymers maintain good solubility, low water uptakes, and excellent thermal and mechanical properties.
      PubDate: 2016-04-19T04:16:26-07:00
      DOI: 10.1177/0954008315585015
      Issue No: Vol. 28, No. 4 (2016)
       
 
 
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