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  Subjects -> ENGINEERING (Total: 1957 journals)
    - CHEMICAL ENGINEERING (150 journals)
    - CIVIL ENGINEERING (146 journals)
    - ELECTRICAL ENGINEERING (84 journals)
    - ENGINEERING (1124 journals)
    - ENGINEERING MECHANICS AND MATERIALS (284 journals)
    - HYDRAULIC ENGINEERING (43 journals)
    - INDUSTRIAL ENGINEERING (53 journals)
    - MECHANICAL ENGINEERING (73 journals)

CHEMICAL ENGINEERING (150 journals)                  1 2     

ACS Combinatorial Science     Full-text available via subscription   (7 followers)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (3 followers)
Acta Polymerica     Hybrid Journal   (4 followers)
Additives for Polymers     Full-text available via subscription   (17 followers)
Adhesion Adhesives & Sealants     Hybrid Journal   (3 followers)
Advanced Chemical Engineering Research     Open Access   (7 followers)
Advances in Applied Ceramics     Partially Free   (2 followers)
Advances in Chemical Engineering     Full-text available via subscription   (14 followers)
Advances in Chemical Engineering and Science     Open Access   (19 followers)
Advances in Polymer Technology     Hybrid Journal   (9 followers)
African Journal of Pure and Applied Chemistry     Open Access  
Annual Review of Analytical Chemistry     Full-text available via subscription   (8 followers)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (8 followers)
Anti-Corrosion Methods and Materials     Hybrid Journal   (3 followers)
Applied Petrochemical Research     Open Access   (3 followers)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (6 followers)
Biochemical Engineering Journal     Hybrid Journal   (8 followers)
Biomass Conversion and Biorefinery     Partially Free   (5 followers)
BMC Chemical Biology     Open Access   (4 followers)
Brazilian Journal of Chemical Engineering     Open Access   (2 followers)
Bulletin of the Chemical Society of Ethiopia     Open Access   (1 follower)
Carbohydrate Polymers     Hybrid Journal   (8 followers)
Catalysts     Open Access   (5 followers)
Chemical and Petroleum Engineering     Hybrid Journal   (7 followers)
Chemical and Process Engineering     Open Access   (3 followers)
Chemical and Process Engineering Research     Open Access   (5 followers)
Chemical Communications     Full-text available via subscription   (28 followers)
Chemical Engineering & Technology     Hybrid Journal   (24 followers)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (9 followers)
Chemical Engineering and Science     Open Access   (2 followers)
Chemical Engineering Communications     Hybrid Journal   (10 followers)
Chemical Engineering Journal     Hybrid Journal   (16 followers)
Chemical Engineering Research and Design     Hybrid Journal   (15 followers)
Chemical Engineering Science     Hybrid Journal   (9 followers)
Chemical Geology     Hybrid Journal   (9 followers)
Chemical Papers     Hybrid Journal   (3 followers)
Chemical Product and Process Modeling     Full-text available via subscription   (3 followers)
Chemical Reviews     Full-text available via subscription   (185 followers)
Chemical Society Reviews     Full-text available via subscription   (26 followers)
Chemical Technology     Open Access   (4 followers)
ChemInform     Hybrid Journal   (3 followers)
Chemistry & Industry     Hybrid Journal   (2 followers)
Chemistry Central Journal     Open Access   (5 followers)
Chemistry of Materials     Full-text available via subscription   (134 followers)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (6 followers)
ChemSusChem     Hybrid Journal   (6 followers)
Chinese Chemical Letters     Full-text available via subscription   (1 follower)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (3 followers)
Chinese Journal of Chemical Physics     Hybrid Journal   (1 follower)
Coke and Chemistry     Hybrid Journal  
Coloration Technology     Hybrid Journal   (1 follower)
Computational Biology and Chemistry     Hybrid Journal   (8 followers)
Computer Aided Chemical Engineering     Full-text available via subscription   (2 followers)
Computers & Chemical Engineering     Hybrid Journal   (6 followers)
Corrosion Engineering, Science and Technology     Hybrid Journal   (18 followers)
Corrosion Reviews     Full-text available via subscription   (4 followers)
Crystal Research and Technology     Hybrid Journal   (2 followers)
Current Opinion in Chemical Engineering     Open Access   (2 followers)
Education for Chemical Engineers     Hybrid Journal   (3 followers)
European Polymer Journal     Hybrid Journal   (41 followers)
Fibers and Polymers     Full-text available via subscription   (3 followers)
Focusing on Modern Food Industry     Open Access   (3 followers)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (1 follower)
Geochemistry International     Hybrid Journal  
High Performance Polymers     Hybrid Journal  
Indian Chemical Engineer     Hybrid Journal   (3 followers)
Indian Journal of Chemical Technology (IJCT)     Open Access   (12 followers)
Industrial & Engineering Chemistry     Full-text available via subscription   (9 followers)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (16 followers)
Industrial Chemistry Library     Full-text available via subscription   (4 followers)
International Journal of Chemical and Petroleum Sciences     Open Access   (1 follower)
International Journal of Chemical Engineering     Open Access   (6 followers)
International Journal of Chemical Reactor Engineering     Full-text available via subscription   (3 followers)
International Journal of Chemical Technology     Open Access   (3 followers)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (2 followers)
International Journal of Food Science     Open Access   (2 followers)
International Journal of Industrial Chemistry     Open Access  
International Journal of Polymeric Materials     Hybrid Journal   (3 followers)
International Journal of Science and Engineering     Open Access   (7 followers)
International Journal of Waste Resources     Open Access   (3 followers)
ISRN Chemical Engineering     Open Access   (3 followers)
ISRN Polymer Science     Open Access   (10 followers)
Journal of Applied Crystallography     Hybrid Journal   (4 followers)
Journal of Applied Electrochemistry     Hybrid Journal   (6 followers)
Journal of Applied Polymer Science     Hybrid Journal   (120 followers)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (7 followers)
Journal of Chemical & Engineering Data     Full-text available via subscription   (6 followers)
Journal of Chemical Ecology     Hybrid Journal   (1 follower)
Journal of Chemical Engineering     Open Access   (3 followers)
Journal of Chemical Engineering and Materials Science     Open Access  
Journal of Chemical Science and Technology     Open Access   (1 follower)
Journal of Chemical Sciences     Partially Free   (13 followers)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (2 followers)
Journal of Chemical Theory and Computation     Full-text available via subscription   (8 followers)
Journal of Coatings     Open Access   (2 followers)
Journal of Crystallization Process and Technology     Open Access   (4 followers)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (5 followers)
Journal of Geochemical Exploration     Hybrid Journal  
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (1 follower)

        1 2     

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  [718 journals]   [SJR: 0.344]   [H-I: 28]
  • Preparation and properties of bisphenol A-based bisphthalonitrile polymers
    • Authors: Chen, Z; Yang, X, Xu, M, Liu, X.
      Pages: 3 - 11
      Abstract: The nitrile groups of 2,2-bis [4-(3,4)-dicyanophenoxy phenyl] propane (bisphthalonitrile; BAPh) can be cured by the nucleophilic phenol groups. Bisphenol A (BPA) can react with 4-nitrophathalonitrile to synthesize BAPh. Therefore, BPA was used as a novel curing agent to react with BAPh. The BAPh/BPA prepolymers and polymers were prepared by heat polymerization. The curing behaviors were characterized using differential scanning calorimetry, dynamic rheological analysis, and thermogravimetric analysis. The results indicate that BPA can decrease the melting temperature of BAPh, shorten the curing time of BAPh with lower curing temperature at 243°C, and widen the processing windows of BAPh to 95–120°C. Meanwhile, BAPh/BPA polymers could withstand temperatures up to 443°C under nitrogen atmosphere and 420°C in air when cured at 240°C for 10 h. The mechanical properties of BAPh/BPA polymers were investigated, and it exhibits a flexural strength of 75 to 122 MPa. Dynamic mechanical analysis was used to evaluate the dynamic mechanical properties of BAPh/BPA polymers. The polymers show glass transition temperature ranging from 244 to 299°C heating and cured to 240°C. Herein, the BAPh/BPA polymers can be a good candidate resin for high-performance polymeric materials.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313493645|hwp:master-id:sphip;0954008313493645
      Issue No: Vol. 26, No. 1 (2014)
       
  • Uncatalyzed synthesis of polyphenylacetylene cross-linked by viologen
           groups and their chemical properties
    • Authors: Yamaguchi, I; Yamamoto, M.
      Pages: 12 - 19
      Abstract: Polyphenylacetylenes cross-linked with viologen groups (polymers 1a and 1b) were obtained from the reaction of 4-ethynylaniline with 1,1'-bis(2,4-dinitrophenyl)-4,4'-bipyridinium dichloride (salt 1) and the reaction of 4-(1-trimethylsilylethynyl)aniline with salt 1, followed by the deprotection of the trimethylsilyl group. Model compound (model 1) was synthesized by the reaction of 4-ethynylaniline with 1-(2,4-dinitrophenyl)-4,4'-bipyridinium chloride (salt 2). Ultraviolet–visible spectra revealed that the polymers 1a and 1b had an expanded -conjugation system along the polymer chain: the polymer showed an onset position of absorption at a wavelength approximately 100 nm longer than the corresponding wavelengths of the model compound. Polymers 1a and 1b received a two-step electrochemical reduction in the viologen group within the polymer and an electrochemical oxidation of the polymer backbone.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313494906|hwp:master-id:sphip;0954008313494906
      Issue No: Vol. 26, No. 1 (2014)
       
  • Comparative studies on the accumulation of strain and recovery ratio of
           Veriflex(R), a shape-memory polymer for a high strain (isin m = 210%):
           Atomic force microscopic experiments
    • Authors: Chowdhury, A. M. S; Schmidt, C, Neuking, K, Eggeler, G.
      Pages: 20 - 26
      Abstract: In the present study, the functional fatigue in the commercial SMP Veriflex®, which is associated with repeating up to maximum 40 programming/one-way effect (1WE) cycles, has been examined. The material is characterized by a glass transition temperature (T g) of 67°C, above which it looses all its strength. An interesting comparative investigation on thermomechanical cycles, including programming, cooling, unloading, and heating to trigger the 1WE, were carried out for Veriflex at 62°C (T < T g, below 5°C but near to T g) and also at 72°C (T > T g, above 5°C but near to T g) for strains of 140% and for a recovery time of 10 min. Accumulation of strain was estimated during the thermomechanical treatments for using strains of 140% at 62°C (T < T g) as well as at 72°C (T > T g). Recovery ratios for strains of 140% at 62°C (T < T g) as well as at 72°C (T > T g) were also estimated. It turns out that programming, cooling, unloading, and heating to trigger the 1WE causes an increase in irreversible strain and is associated with a corresponding decrease in the intensity of the 1WE in particular during the first thermomechanical cycles. Confocal laser scanning microscopic) study shows a very little wavy surface structure evolved during cycling up to strains of 140% at 72°C (T > T g). Infrared study features the chemical nature after cycling, processing, and programming of Veriflex.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313494907|hwp:master-id:sphip;0954008313494907
      Issue No: Vol. 26, No. 1 (2014)
       
  • Fabrication and evaluation of polyaniline nanofibers via ethyl cellulose
           template
    • Authors: RenChun, F; Jun, D, hui, H, Zhong-Cheng, G.
      Pages: 27 - 33
      Abstract: The template method for polymerization has high potential for synthesizing polymer nanotubes, nanofibers, and nanobelts because it controls the diameter and length of the material microstructure. In this study, polyaniline (PANI) nanofibers were successfully prepared with ethyl cellulose as the template. The chemical constituents and crystallinity of the PANI nanofiber samples were investigated by Fourier transform infrared spectroscopy and x-ray powder diffraction. Sample morphology was characterized by scanning and transmission electron microscopy. The size uniformity and electrical conductivity of the PANI nanofibers were also determined. The electrical conductivity of the PANI nanofibers reached up to 13.5 S cm–1 at a hydrochloric acid concentration of 1 mol L–1. The PANI nanoparticles had uniform size, and the PANI nanofibers were disordered. The mechanism of ethyl cellulose as a template for synthesizing PANI nanofibers was also analyzed. This study provides a simple method for synthesizing uniform conductive PANI nanofibers.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495067|hwp:master-id:sphip;0954008313495067
      Issue No: Vol. 26, No. 1 (2014)
       
  • Preparation of expandable graphite via ozone-hydrothermal process and
           flame-retardant properties of high-density polyethylene composites
    • Authors: Shen, M.-Y; Li, K.-Y, Kuan, C.-F, Kuan, H.-C, Chen, C.-H, Yip, M.-C, Chou, H.-W, Chiang, C.-L.
      Pages: 34 - 42
      Abstract: This work presented the ozone (O3)-hydrothermal process to prepare expandable graphite (EG), which is one kind of halogen-free flame retardant. The results showed the expanded volume of EG using the O3-hydrothermal process (O3-HEG), which is higher than those compared with convectional liquid phase synthesis, ultrasound irradiation, and hydrothermal method. Raman spectra and energy dispersive x-ray were used to analyze the structure and confirm that the EG had been prepared. Scanning electron microscope was utilized to observe the morphology of EG and expanded graphite. Thermogravimetric analysis shows that EG can slowdown thermal degradation of polymer and improve the thermal stability of composites. Limiting oxygen index value of composites with 40 wt% loading of O3-HEG is 33, which is higher than that of high-density polyethylene (HDPE)/natural graphite composite. HDPE composites-containing 30 wt % O3-HEG is capable of passing the V-0 classification and has an anti-dripping behavior.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495065|hwp:master-id:sphip;0954008313495065
      Issue No: Vol. 26, No. 1 (2014)
       
  • Studies on synthesis and characterization of multi-walled carbon
           nanotube-reinforced polyimide nanocomposites based on a siloxane-modified
           anhydride
    • Authors: Gunasekaran, S. G; Devaraju, S, Alagar, M, Dharmendirakumar, M.
      Pages: 43 - 51
      Abstract: A novel series of multi-walled carbon nanotube (MWCNT) reinforced siloxane dianhydride based polyimide (PI) nanocomposites were designed and developed using in situ polymerization approach via thermal imidization. The polyamic acid obtained from the reaction of siloxane dianhydride and pyridine diamine/p-phenylenediamine was then incorporated with varying percentages of MWCNTs, which then undergoes thermal imidization to form MWCNT-PI nanocomposites. The synthesized PIs were then characterized using analytical methods. From thermal analysis, it can be seen that the glass transition temperature increased significantly by incorporating acid functionalized MWCNTs into the PI matrix than that of neat PI. This is due to the constraint effect of MWCNTs as well as the reduction in the movement of polymer chains. It exhibits an increased dielectric constant with the increase in weight percentage of MWCNTs to PI matrix. No aggregation and homogeneous dispersion of MWCNTs throughout the PI matrix have been achieved as evidenced by scanning electron microscopy and transmission electron microscopy. The newly designed PI system is responsible for the significant improvement of dispersion, thus enhancing attractive flame retardancy and dielectric properties.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495066|hwp:master-id:sphip;0954008313495066
      Issue No: Vol. 26, No. 1 (2014)
       
  • Syntheses and characterization of two novel
           9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-based flame retardants
           for epoxy resin
    • Authors: Xiao, L; Sun, D, Niu, T, Yao, Y.
      Pages: 52 - 59
      Abstract: Two novel phosphrous–nitrogen-containing flame retardants (3) and (4) were successfully synthesized from two steps: condensation reaction between 4-aminopenol and 1,4-phthaladehyde (or 4,4'-biphenyldicarboxaldehyde) and addition reaction between the above condensation compounds and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. The structures of (3) and (4) were characterized by Fourier transform infrared, nuclear magnetic resonance, and mass spectroscopy methods. The results show that (3) and (4) can serve as co-curing agents of diaminodiphenylmethane (DDM) for the curing reaction of epoxy resin. The epoxy thermosets-containing DDM and (3) or (4) exhibit moderate changes in glass transition temperature, thermal stability, and show improvement in flame retardancy: UL94 V-0 grade can be obtained when phosphorus content of the epoxy thermoset is only 1.0%; the limiting oxygen index of epoxy resin system containing (4) reaches 40.9 when phosphorus content is up to 1.5%.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495064|hwp:master-id:sphip;0954008313495064
      Issue No: Vol. 26, No. 1 (2014)
       
  • Synthesis and properties of polybenzoxazines containing pyridyl group
    • Authors: Shibayama, Y; Kawauchi, T, Takeichi, T.
      Pages: 60 - 68
      Abstract: A novel benzoxazine containing pyridyl group (B-3py) was prepared from 3-aminopyridine, bisphenol A, and paraformaldehyde. Polymerization behavior of B-3py was investigated by differential scanning calorimetry (DSC). The DSC thermograms revealed that the exothermic peak due to the ring-opening polymerization of benzoxazine were shifted to lower temperature range by introducing pyridyl group because the pyridyl group served as a catalyst for the polymerization. B-3py was thermally treated up to 240°C on a glass plate, affording a brown colored transparent polybenzoxazine (PB-3py) film. The dynamic mechanical analysis of the film showed that the glass transition temperature of PB-3py was higher than that of a typical polybenzoxazine without pyridyl group (PB-a). This result is probably due to the further formation of hydrogen bonding through the pyridyl group as suggested by infrared analysis of the film. Moreover, thermogravimetric analysis revealed that 5 and 10% weight loss temperatures and char yield at 850°C of PB-3py were higher than those of PB-a. These results clearly indicate that the thermal properties of polybenzoxazine can be improved by introducing the pyridyl group in the network structure.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495245|hwp:master-id:sphip;0954008313495245
      Issue No: Vol. 26, No. 1 (2014)
       
  • Influence of addition of liquid crystalline copolymer of poly(aryl ether
           ketone) on the properties of basalt fiber/poly(ether ether ketone)
           composites
    • Authors: Fan, Y; Zhang, S. L, Jiang, Z. H, Wang, G. B.
      Pages: 69 - 72
      Abstract: Improving the processability of basalt fiber/poly(ether ether ketone) (BF/PEEK) composites without influencing their mechanical and thermal properties is imperative. A novel liquid-crystalline copolymer of poly(aryl ether ketone) containing fluorine and biphenyl structure (FPEDEKKLCP) was used to decrease the melt viscosity of BF/PEEK composites. The BF/PEEK/FPEDEKKLCP samples were characterized by screw torque measurements, tensile/flexural property evaluation, scanning electron microscopy, and thermogravimetric analysis. The results showed that even a small amount of FPEDEKKLCP could decrease the melt viscosity of the composites during processing, improve the dispersion uniformity and orientation of BF in the PEEK matrix, and increase the flexural modulus, tensile strength, and flexural strength of the BF/PEEK composites. However, the thermal stability of the BF/PEEK composites was almost unaffected by the addition of FPEDEKKLCP.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313495902|hwp:master-id:sphip;0954008313495902
      Issue No: Vol. 26, No. 1 (2014)
       
  • Thermal stability and optical properties of aromatic polyimides containing
           side-substituted azobenzene groups
    • Authors: Sava, I; Burescu, A, Jarzabek, B.
      Pages: 73 - 80
      Abstract: Aromatic azopolyimides based on 9,9-bis[4-(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride and aromatic diamines containing substituted azobenzene group have been studied regarding their thermal and photooptical properties. The thermal analysis showed that the decomposition of these polymers takes place in two or three stages. The optical properties of the investigated polymers have been analyzed by transmission and reflectivity measurements within the spectral range of 200–2500 nm. Temperature dependence of absorption coefficient has been found on the basis of "in situ" transmission measurements, during annealing of thin films up to 300°C. It turned out that this process did not change the conjugation of polymer chain but caused a slightly more, irreversible structural disorder.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313497067|hwp:master-id:sphip;0954008313497067
      Issue No: Vol. 26, No. 1 (2014)
       
  • Study of the thermal decomposition of some azopolyimides
    • Authors: Burescu, A. I; Sava, I, Bruma, M, Lisa, G.
      Pages: 81 - 88
      Abstract: The thermal decomposition of some polyimides containing pendent azobenzene groups was investigated with dynamic thermogravimetric analysis. Thermal degradation of azopolyimides took place in two or three steps. Traditional nonisothermal experiments involved linearizing an equation in some manner and fitting the resulting straight line to obtain the activation energy (E a). The variation in activation energy with conversion degree of these polymers, obtained from two different kinetic methods, such as Flynn–Wall–Ozawa and Friedman, were compared and discussed.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313498787|hwp:master-id:sphip;0954008313498787
      Issue No: Vol. 26, No. 1 (2014)
       
  • Development of hexa (aminophenyl)cyclotriphosphazene-modified cyanate
           ester composites for high-temperature applications
    • Authors: Krishnadevi, K; Grace, A. N, Alagar, M, Selvaraj, V.
      Pages: 89 - 96
      Abstract: The organic–inorganic hybrid of hexa(aminophenyl)cyclotriphosphazene (CPA) was synthesized by reacting hexachlorocyclotriphosphazene with 4-acetamidophenol followed by hydrolysis. The resulting product CPA was then allowed to react with 2,2-bis(4-cyanatophenyl)propane (cyanate ester) in different ratios (5, 10, and 15%) to form six-membered oxygen-linked triazine ring with formation of highly cross-linked network structure. Thermal curing behavior was confirmed using Fourier transform infrared spectroscopy analysis and thermal properties were studied using thermogravimetric analysis and differential scanning calorimetry analyses. Dielectric constant and dielectric loss were measured using impedance analyzer. Data resulted from different studies indicate that these hybrid composites can be used for high-performance thermal applications in the place of conventional cyanate esters for better performance.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313500058|hwp:master-id:sphip;0954008313500058
      Issue No: Vol. 26, No. 1 (2014)
       
  • Synthesis and characterization of silane-grafted polyphenylene sulfide
    • Authors: Di, X; Fang, L, Lin, Q, Zhang, T, Zhou, X.
      Pages: 97 - 105
      Abstract: A novel polyphenylene sulfide (PPS) modified by silane grafting and water cross-linking technology has been prepared using suspension grafting. Fourier transform infrared and x-ray photoelectron spectroscopic spectra demonstrated the achievement of silane grafting and subsequent water cross-linking. The grafting degree could be adjusted by altering the silane/PPS molar ratio, reaction temperature, reaction time, and so on. Wide angle x-ray diffraction analysis showed that the crystallinity and crystal size of the modified PPS decreased with increase in the grafting degree. Differential scanning calorimeter results also confirmed that the crystallinity and crystallization temperature decreased with the increase in the grafting degree. The silane-grafted PPS exhibited two weight loss stages in thermogravimetric curves, and the initial thermal decomposition temperature was much higher than the processing temperature. Therefore, the silane-grafted PPS is thermally stable enough to be used as a high-performance polymer and polymer matrix for structural applications. The extent of silane grafting plays a key role in the improvement of the impact toughness of the silane-grafted PPS. With the increasing silane grafting degree, the impact strength of the silane-grafted PPS/neat PPS blends obviously increased.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313499802|hwp:master-id:sphip;0954008313499802
      Issue No: Vol. 26, No. 1 (2014)
       
  • Triple-layer sulfonated poly(ether ether ketone)/sulfonated polyimide
           membranes for fuel cell applications
    • Authors: Li, X; Song, Y, Liu, Z, Feng, P, Liu, S, Yu, Y, Jiang, Z, Liu, B.
      Pages: 106 - 113
      Abstract: A series of triple-layer membranes were prepared based on a sulfonated polyimide (SPI) and a traditional sulfonated poly(ether ether ketone) (SPEEK) polymer matrix. Compared with the single-component membranes (pure SPI and SPEEK), the multicomponent membranes exhibited better comprehensive performance. Interestingly, the triple-layer membranes possessed improved mechanical properties, lower water uptake, and swelling ratio than those of the corresponding blend membranes. When the contents of SPI were 30 and 40%, the triple-layer membranes even had lower methanol permeability (3.42 and 2.61 10–7 cm2 s–1, respectively) than that of the pure SPI membrane (3.51 10–7 cm2 s–1). The proton conductivity of the triple-layer membranes was in the range of 0.117–0.149 S cm–1 at 100°C. All the results suggest that the triple-layer membranes have sufficiently excellent performance to be applied in fuel cells.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313499803|hwp:master-id:sphip;0954008313499803
      Issue No: Vol. 26, No. 1 (2014)
       
  • Preparation and properties of epoxy resin composites containing
           hexaphenoxycyclotriphosphazene
    • Authors: Pan, M; Huang, R, Wang, T, Huang, D, Mu, J, Zhang, C.
      Pages: 114 - 121
      Abstract: Hexaphenoxycyclotriphosphazene (HPCTP) was synthesized by a nucleophilic substitution reaction between hexachlorocyclotriphosphazene and phenol. The chemical structure of HPCTP was then characterized by Fourier transform infrared spectroscopy as well as 1H and 31P nuclear magnetic resonance spectroscopy. The synthesized HPCTP was incorporated into the diglycidyl ether of bisphenol A to prepare epoxy resin (EP) composites using 4,4'-diamino diphenylmethane as curing agent. The thermal and flame-retardant properties of cured samples were investigated by differential scanning calorimetry, thermogravimetric analysis, UL-94 vertical burning test, and cone calorimetry. Evaluation of thermal properties demonstrated that the resulting composites achieved high thermal stability with high char yields. The UL-94 V-0 rating was easily achieved with the addition of HPCTP, and the heat release intensity simultaneously decreased. Results of scanning electron microscopy and energy-dispersive x-ray spectroscopy confirmed that HPCTP can enhance the thermal stability and flame retardancy of epoxy resin.
      PubDate: 2014-01-24T04:26:30-08:00
      DOI: 10.1177/0954008313501008|hwp:master-id:sphip;0954008313501008
      Issue No: Vol. 26, No. 1 (2014)
       
 
 
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