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  Subjects -> ENGINEERING (Total: 2018 journals)
    - CHEMICAL ENGINEERING (161 journals)
    - CIVIL ENGINEERING (154 journals)
    - ELECTRICAL ENGINEERING (86 journals)
    - ENGINEERING (1135 journals)
    - ENGINEERING MECHANICS AND MATERIALS (307 journals)
    - HYDRAULIC ENGINEERING (48 journals)
    - INDUSTRIAL ENGINEERING (52 journals)
    - MECHANICAL ENGINEERING (75 journals)

CHEMICAL ENGINEERING (161 journals)                  1 2     

ACS Combinatorial Science     Full-text available via subscription   (Followers: 9)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 6)
Additives for Polymers     Full-text available via subscription   (Followers: 21)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 8)
Advanced Powder Technology     Hybrid Journal   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 16)
Advances in Chemical Engineering and Science     Open Access   (Followers: 22)
Advances in Polymer Technology     Hybrid Journal   (Followers: 11)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 4)
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: 4)
Applied Petrochemical Research     Open Access   (Followers: 3)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 8)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
BMC Chemical Biology     Open Access   (Followers: 4)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Catalysts     Open Access   (Followers: 7)
Chemical and Engineering News     Free  
Chemical and Materials Engineering     Open Access  
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 8)
Chemical and Process Engineering     Open Access   (Followers: 3)
Chemical and Process Engineering Research     Open Access   (Followers: 5)
Chemical Communications     Full-text available via subscription   (Followers: 29)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 24)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 10)
Chemical Engineering and Science     Open Access   (Followers: 2)
Chemical Engineering Communications     Hybrid Journal   (Followers: 10)
Chemical Engineering Journal     Hybrid Journal   (Followers: 20)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 16)
Chemical Engineering Science     Hybrid Journal   (Followers: 11)
Chemical Geology     Hybrid Journal   (Followers: 9)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Full-text available via subscription   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 323)
Chemical Society Reviews     Full-text available via subscription   (Followers: 31)
Chemical Technology     Open Access   (Followers: 5)
ChemInform     Hybrid Journal   (Followers: 3)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 222)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 1)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Coke and Chemistry     Hybrid Journal  
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 8)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 7)
CORROSION     Full-text available via subscription  
Corrosion Reviews     Full-text available via subscription   (Followers: 4)
Crystal Research and Technology     Hybrid Journal   (Followers: 2)
Current Opinion in Chemical Engineering     Open Access   (Followers: 3)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Ekologia : The Journal of Institute of Landscape Ecology of Slovak Academy of Sciences     Open Access  
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 41)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Focusing on Modern Food Industry     Open Access   (Followers: 3)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Geochemistry International     Hybrid Journal  
Handbook of Powder Technology     Full-text available via subscription   (Followers: 2)
High Performance Polymers     Hybrid Journal  
Indian Chemical Engineer     Hybrid Journal   (Followers: 3)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 12)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 18)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 4)
Info Chimie Magazine     Full-text available via subscription  
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     Full-text available via subscription   (Followers: 3)
International Journal of Chemical Technology     Open Access   (Followers: 4)
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: 3)
International Journal of Science and Engineering     Open Access   (Followers: 7)
International Journal of Waste Resources     Open Access   (Followers: 5)
ISRN Chemical Engineering     Open Access   (Followers: 4)
ISRN Polymer Science     Open Access   (Followers: 11)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 4)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 11)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 206)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 7)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 2)
Journal of Chemical Engineering     Open Access   (Followers: 4)
Journal of Chemical Engineering and Materials Science     Open Access  
Journal of Chemical Science and Technology     Open Access   (Followers: 2)
Journal of Chemical Sciences     Partially Free   (Followers: 15)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 2)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 9)

        1 2     

Journal Cover High Performance Polymers
   Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 0954-0083 - ISSN (Online) 1361-6412
     Published by Sage Publications Homepage  [753 journals]   [SJR: 0.344]   [H-I: 28]
  • Effect of the hard segment structure on properties of resorcinol
           derivatives-based polyurethane elastomers
    • Authors: Oprea, S; Joga, A, Zorlescu, B, Oprea, V.
      Pages: 859 - 866
      Abstract: Two series of polyurethane elastomers were obtained from poly(1,4-butylene adipate) diol and 1,6-diisocyanatohexane, which were then chain extended with resorcinol derivatives such as benzene-1,3-diol, 2,4-dihydroxybenzaldehyde, or 1-(2,4-dihydroxyphenyl) hexan-1-one. This article investigates the effects induced in polyurethane elastomer properties by varying the hard segment composition through changing the amount of aliphatic diisocyanate and through the influence of the chemical structure of the resorcinol derivatives’ chain extenders. The different chemical composition and the presence of different dangling chains on the chain extender structure influenced hard segment cohesion, resulting in important effects on the polyurethane elastomer properties. The incorporation of aliphatic diisocyanate alongside the aromatic chain extender leads to changes in the physical and mechanical properties of the polyurethane elastomers compared with aromatic rigid diisocyanates. These polyurethane elastomers were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and mechanical measurements. We synthesized resorcinol-based polyurethane elastomers with aliphatic–aromatic hard segment structures, with the resorcinol addition making it unnecessary to transform phenolic OH groups into aliphatic OH groups.
      PubDate: 2014-12-02T03:56:49-08:00
      DOI: 10.1177/0954008314533359|hwp:master-id:sphip;0954008314533359
      Issue No: Vol. 26, No. 8 (2014)
       
  • Solvation effects on the ground and excited states of p-n
           diblock-conjugated polymers: Theoretical insights
    • Authors: Zheng, C; Wang, Y, Chen, R, Ji, Y, Huang, W.
      Pages: 867 - 873
      Abstract: A semiempirical study was carried out to give theoretical insights of the solvation effects on the absorption and emission wavelength of oxadiazole-containing p–n diblock-conjugated polymers at both ground and excited states on the basis of experimental results. The Conductor-like Screening Model was used to calculate the absorption and emission wavelengths of the carefully designed model molecules in solvents with different dielectric constants (approximately = 1–35) from the optimized ground states and the lowest excited states by coupling AM1 formalism to the new configuration interaction scheme. The calculated results agree well with the experimental observations of the corresponding polymers. The geometrical modifications, charge changes upon photoexcitation, frontier orbital distributions, and dipoles of the two model molecules were investigated and discussed to explain the different solvation behavior of the corresponding diblock copolymers. The different charge-transfer behavior was suggested to be the major factor that causes the varied solvation effects of the p–n diblock molecular systems at excited states upon photoluminescence. These findings may provide important insights at the molecular level for selectively tuning the solvatochromic properties of p–n diblock-conjugated polymers for practical applications.
      PubDate: 2014-12-02T03:56:49-08:00
      DOI: 10.1177/0954008314533360|hwp:master-id:sphip;0954008314533360
      Issue No: Vol. 26, No. 8 (2014)
       
  • Toughness reinforcement of bismaleimide resin using functionalized carbon
           nanotubes
    • Authors: Han, Y; Zhou, H, Ge, K, Guo, Y, Liu, F, Zhao, T.
      Pages: 874 - 883
      Abstract: Carbon nanotubes (CNTs) with various functionalization states were used to toughen bismaleimide resin. Differential scanning calorimeter and rheometric measurements were conducted to monitor the processability of the hybrid systems. The toughness of the corresponding composites was investigated by Charpy impact and flexural tests, while the thermal properties were obtained from dynamic mechanical and thermogravimetric analyses. The results showed that the loading and functionalization state of the CNTs in the resin matrix had a great influence on the mechanical performance and glass transition temperature, but less influence on thermal decomposition temperature of the composites. These phenomena could be attributed to the differences in dispersion state, interfacial adhesion, and interfacial compatibility of CNTs in the resin matrix. Compared with the pure resin, composites containing 0.50 wt% diaminodiphenylmethane-treated CNTs showed 60% improvement in impact strength and 100% improvement in flexural toughness while preserving their thermal properties.
      PubDate: 2014-12-02T03:56:49-08:00
      DOI: 10.1177/0954008314533578|hwp:master-id:sphip;0954008314533578
      Issue No: Vol. 26, No. 8 (2014)
       
  • Studies on the thermal properties of poly(1,4-butylene
           terephthalate)/microencapsulated ammonium polyphosphate composites
    • Authors: Li, Z; Zhou, S, Wang, X, He, Q, Zhang, Y, She, S, Chen, G, Yang, W.
      Pages: 884 - 891
      Abstract: This work aims to explore the potential of microencapsulated ammonium polyphosphate (MAPP) in poly(1,4-butylene terephthalate) (PBT). PBT/MAPP composites were prepared via melt blending method. The study of their thermal behaviors and thermal stability showed that the addition of MAPP with silica gel shell (MAPP(Si)) improved the relative crystallinity and thermal stability of PBT composites, in comparison with untreated ammonium polyphosphate and MAPP with polyurethane shell. Possible mechanisms for PBT/MAPP(Si) composites were investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results indicated that several PBT molecules may be grafted onto the surface of MAPP(Si), which improves the relative crystallinity and thermal stability of PBT/MAPP(Si) composites.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314533809|hwp:master-id:sphip;0954008314533809
      Issue No: Vol. 26, No. 8 (2014)
       
  • Covalent incorporation of aminated carbon nanotubes into epoxy resin
           network
    • Authors: Sun, T; Fan, H, Zhuo, Q, Liu, X, Wu, Z.
      Pages: 892 - 899
      Abstract: In order to expand applied field of epoxy resin, its mechanical properties have to be improved. Carbon nanotube (CNT) is regarded as an exceptional toughening agent for polymers. However, poor dispersion quality of CNT in polymer matrix and weak interfacial force between them commonly lead to low reinforcing efficiency. This article presented a study on the mechanical properties of epoxy composite reinforced with aminated CNT (CNT-NH2). The amination of CNT was achieved via a wet chemical procedure using 1,6-diaminohexane (DAH) as amine source. Fourier transform infrared spectroscopy, zeta potential test, and thermogravimetric analysis were employed to investigate the as-prepared CNT-NH2. The results show that DAH has been successfully grafted onto the surface of CNT. Scanning electron microscopic images show that CNT-NH2 is homogenously dispersed in epoxy matrix. Mechanical properties tests suggest that the tensile strength and fracture toughness of the obtained CNT-NH2/epoxy composite are all enhanced compared with cured pure epoxy resin. The tensile strength and fracture toughness of the as-prepared CNT-NH2/epoxy composite with 0.8 wt% CNT-NH2 show 42% and 95% improvement, respectively. These results indicate that CNT-NH2 is a promising toughening agent for enhancing the mechanical properties of epoxy resin.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314533810|hwp:master-id:sphip;0954008314533810
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis of polystyrene nanolatexes via emulsion polymerization using
           sodium dodecyl sulfonate as the emulsifier
    • Authors: Yang, L; Ke, Y.
      Pages: 900 - 905
      Abstract: Polystyrene (PS) nanolatexes were successfully prepared via emulsion polymerization using sodium dodecyl sulfonate as the emulsifier. The effects of emulsifier concentration, initiator concentration, polymerization reaction time, and polymerization reaction temperature on particle size and size distribution of PS colloidal spheres were investigated, respectively. The particle size of the diluted polymer emulsion was about 20 nm, as determined by laser scattering. These obtained PS particles were also characterized using Fourier transform infrared spectroscopy and scanning electron microscopy.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314533979|hwp:master-id:sphip;0954008314533979
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis and properties of main-chain oligomeric benzoxazine precursor
           containing cyclotriphosphazene units
    • Authors: Tan, Z.-W; Wu, X, Zhang, M, Qiu, J.-J, Liu, C.-M.
      Pages: 906 - 913
      Abstract: A linear oligobenzoxazine precursor with cyclotriphosphazene ring was prepared through the Schiff base route. The resulting polymers showed higher molecular weight and better thermal stability than those from the traditional Mannich polycondensation method. The oligomeric benzoxazine precursor can form a high-quality transparent yellow film; however, it was fragile after being cured. In order to identify the effect of end groups on the cured polymer, an aniline-capped polymer was prepared by the same Schiff base method and then was changed into a benzoxazine end group. The results indicated that the uncapped polymer exhibited higher stability than the capped polymer. This can be ascribed to different chemical structures resulting from different end groups.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314533980|hwp:master-id:sphip;0954008314533980
      Issue No: Vol. 26, No. 8 (2014)
       
  • The influence of processing aids on the properties of poly (arylene
           sulfide sulfone)
    • Authors: Kong, Y; Huang, G, Zhang, G, Wang, X, Long, S, Yang, J.
      Pages: 914 - 921
      Abstract: Zinc acetate (ZnAc) and diphenyl sulfone were used as melt stabilizer and plasticizer to improve the stability and flowability of poly (arylene sulfide sulfone) (PASS) during the melt processing. The effects of these processing aids on rheological, mechanical, dynamic mechanical, and thermal properties of PASS and their compatibility with the polymer matrix were investigated. Both capillary rheometer and parallel plate rheometer measurements showed that the processing aids could significantly improve stability and mobility of PASS melts, especially the compounding aid. Dynamic mechanical analysis and tensile test indicated that diphenyl suflone increased the stiffness of pure PASS at lower temperature (T < T g) and showed effectual plasticizing effects at higher temperature (T > T g), and ZnAc decreased the stiffness and T g of pure PASS. The compatibility and thermal performance of PASS with diphenyl sulfone or ZnAc were also discussed.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314534278|hwp:master-id:sphip;0954008314534278
      Issue No: Vol. 26, No. 8 (2014)
       
  • Role of functionalized multiwalled carbon nanotubes on mechanical
           properties of epoxy-based composites at cryogenic temperature
    • Authors: He, Y; Chen, G, Zhang, L, Sang, Y, Lu, C, Yao, D, Zhang, Y.
      Pages: 922 - 934
      Abstract: In order to obtain multiwalled carbon nanotubes (MWNTs)/epoxy composites with good mechanical properties at cryogenic temperature, two methods were adopted to modify MWNTs. MWNTs were first treated by acid mixture (oxidized MWNTs, O-MWNTs) and then maleic anhydride (MA) and isophorone diisocyanate (IPDI) grafting was carried out. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses proved the effectiveness of acid mixture treatment and confirmed the grafting reaction of MA and IPDI with MWNTs. High-resolution transmission electron microscopy analysis indicates that MA and IPDI chain were grafted onto the MWNTs surface, creating a rigid covalent bond between MWNTs and epoxy resin and forming a thin layer. The tensile strength, Young’s modulus, and impact strength of composites at liquid nitrogen temperature (77 K) are all enhanced by the addition of MWNTs. Results of dynamic mechanical analysis indicated that introducing a small amount of functionalized MWNTs to epoxy can enhance their storage modulus at 77 K and glass transition temperature of composites. The results indicated that surface-modified MWNTs can be effectively utilized to improve the properties of epoxy-based composites at cryogenic temperature.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314534279|hwp:master-id:sphip;0954008314534279
      Issue No: Vol. 26, No. 8 (2014)
       
  • Nonisothermal and isothermal oxidative degradation behavior of
           thermotropic liquid crystal polyesters containing kinked bisphenol AF and
           bisphenol A units
    • Authors: Wei, P; Wang, L, Wang, X, Chen, Y, Wang, Y, Wang, Y.
      Pages: 935 - 945
      Abstract: The polyester P–bisphenol AF 2.5 (BPAF 2.5) and P-bisphenol A 2.5 (BPA 2.5) with low melting temperature and high glass transition temperature can be obtained by introducing 2.5 mol% BPAF/BPA and terephthalic acid (TA) units respectively into the molecular chain of poly(oxybenzoate-co-oxynaphthoate) (P-HBA70). In this study, the nonisothermal and isothermal oxidative degradation behavior of polyester P-BPA2.5 and P-BPAF2.5 were investigated comparatively with parent polyester P-HBA70 by thermogravimetric analysis, Fourier transform infrared spectroscopy, and scanning electron microscopy measurements. The introduction of BPAF/BPA units into the molecular chain of P-HBA70 strongly influenced the degradation behavior of polyesters. Four multiple heating rate methods including Kissinger, Kim–Park, Flynn–Wall–Ozawa, and Friedman methods were applied to evaluate the dynamic thermal stability successfully. The following order of the activation energy values: P-BPAF2.5 > P-HBA70 > P-BPA2.5 can be found for the three samples. However, from the results obtained by the standard isoconversional method, the P-BPA2.5 showed a better thermal stability as compared to P-BPAF2.5 under isothermal atmosphere.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314535645|hwp:master-id:sphip;0954008314535645
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis, characterization and photoresponsive behaviour of a series of
           azobenzene-containing poly(ether sulfone)s with high glass transition
           temperatures
    • Authors: Zhang, Y; Zhang, Q, Pei, S, Wang, Y, Zhang, H, Jiang, Z.
      Pages: 946 - 952
      Abstract: To improve the stability of photoinduced birefringence, a series of azobenzene-functionalized poly(ether sulfone)s (azo-PES) with high glass transition temperature (T g) were successfully synthesized via Ullmann coupling between PES with bromine side groups and azo compound 4-((4-methoxyphenyl)diazenyl)phenol. Their chemical structures and properties were characterized by means of ultraviolet–visible and proton nuclear magnetic resonance spectroscopies. The results of differential scanning calorimetry and thermogravimetric analysis suggested that the polymers had high T gs and good thermal stability. Upon irradiation with a 532 nm neodymium-doped yttrium aluminium garnet (Nd:YAG) laser beam, these azo polymers presented large photoinduced birefringence with a remnant value up to 94%, indicating good stability of the photoinduced orientation. Furthermore, multiple writing/erasing experiments indicate that the azo polymers have potential applications in reversible optical storage.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314535646|hwp:master-id:sphip;0954008314535646
      Issue No: Vol. 26, No. 8 (2014)
       
  • Comparison and analysis of physical properties of carbon
           nanomaterial-doped polymer composites
    • Authors: Bal, S; Saha, S.
      Pages: 953 - 960
      Abstract: Low-temperature curing approach has been adopted to fabricate the composites along with room temperature method involving four types of nanofillers. With the purpose to investigate the multifunctionality caused by carbon nanotubes (CNTs)/carbon nanofibers (CNFs), mechanical properties such as flexural modulus, flexural strength, and hardness and electrical property such as conductivity of various epoxy nanocomposites were determined. These results were supplemented and complemented by scanning electron microscopy and transmission electron microscopy. Both mechanical and microscopic observations indicated that among all the nanocomposites, refrigerated, aligned CNTs and functionalized CNT composites show a significant reinforcement in the epoxy matrix along with bridging mechanism. Lower mechanical results were obtained in CNF composites that attributes to breaking of nanofibers after mechanical tests. All nanocomposites showed electrical percolation that occurs due to network formation of nanoparticles inside the matrix.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314535823|hwp:master-id:sphip;0954008314535823
      Issue No: Vol. 26, No. 8 (2014)
       
  • Study on physical properties of poly(methyl methacrylate)/poly(thiophene
           amide)-silica-titania-grafted multiwalled carbon nanotube-based nanofiber
           composites
    • Authors: Kausar; A.
      Pages: 961 - 969
      Abstract: In the present study, poly(thiophene amide) (PTA) was prepared from 1,3-phenylenediamine, 2,4-diaminophenol, and 2,5-thiophenedicarbonyl. Thermally and mechanically stable poly(methyl methacrylate) (PMMA)-based nanocomposites have been produced through the reinforcement of electrospun PTA-silica–titania-grafted multiwalled carbon nanotube (MWCNT-PTA-Si-Ti)-based nanofiber. MWCNT was initially modified to prepare 3-isocyanatopropyltriethoxysilane (ICTOS)-grafted MWCNT via a sol–gel route using 3-isocyanatopropyl-triethoxysilane and titanium(iv) butoxide. The titania–silica network was developed and linked to MWCNT via hydrolysis and condensation. Afterward, the above-prepared ICTOS-grafted MWCNT was electrospun with aramid solution. The electrospun MWCNT-PTA-Si-Ti nanofibers (0.1–1 wt%) were then reinforced in PMMA matrix. Tensile strength and modulus of PMMA/MWCNT-PTA-Si-Ti 0.1 were 42.1 MPa and 8 GPa, which were increased to 44.2 MPa and 15 GPa in PMMA/MWCNT-PTA-Si-Ti 1. Thermal decomposition temperature at 10% weight loss of these PMMA/MWCNT-PTA-Si-Ti 0.1-1 hybrids was in the range of 532–578°C. The glass transition temperature as determined from the maxima of tan data using dynamic mechanical thermal analysis showed an increase with the filler loading and was maximum (313°C) for the composite with 1 wt% MWCNT-PTA-Si-Ti nanofibers.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536213|hwp:master-id:sphip;0954008314536213
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis of carbon nanotubes/polyacrylamide nanocomposites with improved
           load-carrying capacity and antiwear ability
    • Authors: Zhang, L; Shi, T, Wu, S, Zhou, H.
      Pages: 970 - 977
      Abstract: In this study, the functionalized carbon nanotubes (CNTs) were prepared and used for the first time as a high-efficient dispersant for the synthesis of CNTs/polyacrylamide nanocomposites via dispersion polymerization. The results showed that the functionalized CNTs not only could be use as an effective solid stabilizer for dispersion polymerization but also could be homogeneously dispersed into the production of polyacrylamide as nanofillers by this method. Furthermore, the functionalized CNTs/polyacrylamide nanocomposites can be dissolved in water and can effectively improve the load-carrying capacity and antiwear ability of base stock as a good lubricant additive in water-based fluid.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536214|hwp:master-id:sphip;0954008314536214
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis and characterization of novel polyimides derived from
           2,4-bis(4-aminophenoxy)pyrimidine
    • Authors: Wang; Y.
      Pages: 978 - 985
      Abstract: A novel heterocyclic diamine monomer based on pyrimidine ring, 2,4-bis(4-aminophenoxy)pyrimidine, was successfully synthesized. The obtained heterocyclic diamine was fully characterized and employed to synthesize a series of polyimides (PIs) by polycondensation with commercially available aromatic dianhydrides via the conventional two-step method. The effects of the pyrimidine rings into the main chain of the PIs were evaluated through the study of their solubility, thermal, mechanical, and optical properties. The inherent viscosities of the resulting poly(amic acid)s were in the range of 0.58–1.45 dL g–1. Meanwhile, the PIs had good thermal stability with the 5% weight loss temperatures of 445–475°C under nitrogen atmosphere as well as outstanding mechanical properties with tensile strength of 93–105 MPa and elongation at break of 3.6–4.2%. The cutoff wavelength of the PI films were in the range of 348–413 nm.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536216|hwp:master-id:sphip;0954008314536216
      Issue No: Vol. 26, No. 8 (2014)
       
  • Incorporation of elastomer into poly(ether ether ketone): an attempt to
           improve the damping factor
    • Authors: Parpaite, T; Sosson, F, Sonnier, R, Clerc, L, Bergeret, A.
      Pages: 986 - 996
      Abstract: The incorporation of an elastomer phase into a poly(ether ether ketone) (PEEK) matrix was carried out using two different processing methods (melt blending (MB) and dry blending) to improve the damping factor (tan ) of the composite with a minimal change in the PEEK stiffness. A cross-linked fluoroelastomer (CFE) was carefully chosen according to its high glass transition temperature (T α), high thermal stability and high modulus. The blends were characterized by scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA), modified Oberst test, flexural test and pyrolysis combustion flow calorimeter. According to SEM micrographs, an original well-dispersed PEEK-elastomer composite was obtained. The tan of the materials was evaluated using DMTA and modified Oberst test. Both techniques indicate that the incorporation of 5–20 wt% of CFE fine powders only slightly increased the tan of the material. Moreover, a decrease in flexural modulus and thermal stability of the blends was detected when there was an increase in the CFE content. Even if the properties are not yet significantly improved, it was well ascribed that the MB method was suitable to mix elastomer particles within a PEEK matrix. Poor interfacial adhesion has been identified as the main key parameter, which should be improved in further work.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536592|hwp:master-id:sphip;0954008314536592
      Issue No: Vol. 26, No. 8 (2014)
       
  • Sulfonated aromatic copoly(ether-amide) membranes: preparation and
           characterization for possible application in polymer electrolyte membrane
           fuel cells
    • Authors: Sosa-Gonzalez, W.-E; del Jesus, P.-C. R, de Jesus, A.-V. M.
      Pages: 997 - 1006
      Abstract: Sulfonated membranes from highly aromatic copoly(ether–amide)s with sulfonation degrees (SDs) between 20 mol% and 55 mol% were prepared from the combination of diamines, 4,4'-(hexafluoroisopropylidene)-bis-(p-phenyleneoxy)dianiline (HFD), and different molar concentrations of 2,4-diaminobenzenesulfonic acid (DABS) that were reacted with equimolar amounts of isophthalic acid (ISO). The ionic membranes show–SO3H groups in the expected concentrations as assessed by Fourier transform infrared and proton nuclear magnetic resonance. Sulfonated copoly(ether–amide) membranes show the first thermal decomposition at 281°C for the sulfonic moieties and a second thermal loss at 439°C for the rigid nonsulfonated backbone which imparts them their high thermal stability. The ion-exchange capacity and water absorption in the sulfonated copoly(ether–amide)s increase steadily with SD. The copoly(ether–amide) with the larger SD, 55 mol% of DABS, HFD-co-ISO/DABS-55, shows the highest proton conductivity (91 mS cm–1) at 75°C. These results situate HFD-co-ISO/DABS-55 as a possible electrolyte membrane for use in polymer electrolyte membrane fuel cell with high thermal and mechanical stability.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536593|hwp:master-id:sphip;0954008314536593
      Issue No: Vol. 26, No. 8 (2014)
       
  • Synthesis and properties of cross-linkable poly (aryl ether ketone)
           oligomers terminated with phthalonitrile group
    • Authors: Zhang, H; Liu, T, Yan, W, Su, Y, Yu, H, Yang, Y, Jiang, Z.
      Pages: 1007 - 1014
      Abstract: Two kinds of phthalonitrile end-capped poly (aryl ether ketone) oligomers (CN-o-PEEK and 2CN-o-PEEK) have been synthesized. The two molecular structures were identified using Fourier transform infrared, nuclear magnetic resonance, and elemental analysis. Hydroxy-containing CN-o-PEEK can be thermal polymerized by duration at 225°C for various times, even in the absence of curing additives. Char yields at 800°C after heat treatment for 60 min were 55%. 2CN-o-PEEK was cured in the presence of p-bis[4-(4-aminophenoxy) phenyl]sulfone via heating its powders up to 275–375°C. The synthesized oligomers have good solubility, whereas the cured samples become insoluble in common organic solvents. The resulting cured samples exhibit no glass transition temperature up to 400°C as measured by differential scanning calorimetry and possess excellent thermal stability.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314536594|hwp:master-id:sphip;0954008314536594
      Issue No: Vol. 26, No. 8 (2014)
       
  • Silane cross-linked proton electrolyte membranes based on branched
           sulphonated poly(ether ether ketone)s with high sulphonation degree for
           direct methanol fuel cells
    • Authors: Li, Y; Wang, X, Xie, M, Liang, Y, Liu, X, Wang, C.
      Pages: 1015 - 1024
      Abstract: In this study, the silane cross-linked membranes based on branched sulphonated poly(ether ether ketone)s (BSPEEK) with a high sulphonation degree of 1.2 have been successfully prepared for direct methanol fuel cells. 3-Mercaptopropyltrimethoxysilane (MPTMS) was grafted onto the BSPEEK backbone via the thiol–ene click reaction between propenyl and thiol groups. The expected silane cross-linked structure within the membrane was confirmed by Fourier transform infrared spectroscopy and solubility test. The silane cross-linked membranes displayed excellent chemical stability and improved mechanical property. Furthermore, the water uptake and methanol permeability of the membranes decreased with the increasing proportion of MPTMS. The dense membrane structure formed by Si–O–Si cross-linking made a great contribution to the improvement of the membrane’s properties. Therefore, the as-prepared membranes may be potential proton electrolyte membrane for fuel cells.
      PubDate: 2014-12-02T03:56:50-08:00
      DOI: 10.1177/0954008314537097|hwp:master-id:sphip;0954008314537097
      Issue No: Vol. 26, No. 8 (2014)
       
 
 
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