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  Subjects -> ENGINEERING (Total: 2051 journals)
    - CHEMICAL ENGINEERING (169 journals)
    - CIVIL ENGINEERING (158 journals)
    - ELECTRICAL ENGINEERING (87 journals)
    - ENGINEERING (1142 journals)
    - ENGINEERING MECHANICS AND MATERIALS (318 journals)
    - HYDRAULIC ENGINEERING (49 journals)
    - INDUSTRIAL ENGINEERING (52 journals)
    - MECHANICAL ENGINEERING (76 journals)

CHEMICAL ENGINEERING (169 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: 9)
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   (Followers: 1)
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: 30)
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: 12)
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: 336)
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: 235)
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)
Fluorescent Materials     Open Access  
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)
Heat Exchangers     Open Access   (Followers: 1)
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: 19)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 4)
Info Chimie Magazine     Full-text available via subscription   (Followers: 1)
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: 213)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 8)
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: 3)
Journal of Chemical Sciences     Partially Free   (Followers: 15)

        1 2     

Journal Cover High Performance Polymers     [SJR: 0.344]   [H-I: 28]
   Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0954-0083 - ISSN (Online) 1361-6412
   Published by Sage Publications Homepage  [754 journals]
  • Influence of polytetrafluoroethylene (PTFE) content on mechanical and
           tribological properties of poly(ether ether ketone)/PTFE coatings prepared
           by electrostatic powder spraying technique
    • Authors: Zhu, S; Zhang, Y, Li, Q, Wei, L, Guan, S.
      Pages: 3 - 9
      Abstract: Poly(ether ether ketone) (PEEK)/polytetrafluoroethylene (PTFE) composite coatings with different PTFE contents were successfully fabricated using electrostatic spraying. The crystalline structure of the PEEK/PTFE coatings was characterized by X-ray diffraction analysis. The effects of PTFE addition in the composite coatings on the hardness, adhesion, and tribological performance were discussed. The hardness and adhesion level of PEEK/PTFE coatings were not significantly affected by the addition of PTFE, which indicated that the coating possesses excellent mechanical properties. The PEEK/PTFE coatings showed better tribological performance than traditional PEEK coating. The PTFE/PTFE-3 (3 wt% mass fraction of PTFE in composite coating) coating has a friction coefficient of 0.133 (PEEK is 0.149) and wear rates of 3.8 x 10–5 mm3 N–1 m–1 (PEEK is 4.4 x 10–5 mm3 N–1 m–1).
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314537098|hwp:master-id:sphip;0954008314537098
      Issue No: Vol. 27, No. 1 (2014)
       
  • Asymmetric membranes prepared with trifluoromethylphenylated poly(ether
           ether ketone) for gas separation
    • Authors: Yu, Y; Liu, S, Wang, Y, Zhang, H, Li, X, Jiang, Z, Liu, B.
      Pages: 10 - 18
      Abstract: A series of asymmetric membranes based on a trifluoromethylphenylated poly(ether ether ketone) (CF3-PEEK) were prepared using a dry–wet phase inversion method. To obtain the asymmetric membranes with defect-free skin, the type and concentration of internal nonsolvent and the evaporation time were carefully investigated. The cross-section of membranes was characterized by scanning electron microscopy. The gas separation performance of asymmetric membranes was tested in terms of gas permeabilities and selectivities for helium, carbon dioxide (CO2), oxygen (O2), and nitrogen by the constant volume method. It was found that the permeabilities of asymmetric membranes were obviously higher than that of CF3-PEEK dense membrane. The membranes in series 2 showed higher permeability for each gas while the separability for gas pair CO2/O2 increased from 3.78 to about 6 comparing with that of the dense membrane.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314537099|hwp:master-id:sphip;0954008314537099
      Issue No: Vol. 27, No. 1 (2014)
       
  • Microwave-assisted synthesis and characterization of resole-type phenolic
           resins
    • Authors: Srivastava, K; Srivastava, D, Tripathi, S. K.
      Pages: 19 - 30
      Abstract: Resoles were prepared under microwave irradiation with different phenols, such as phenol, o-, p-, and m-cresols, separately with formaldehyde having formaldehyde/phenol ratio of 2:1 in basic medium. Analogical synthesis was performed using conventional heating for comparing the methods. The methylolation of phenol was confirmed by Fourier transform infrared spectroscopic analysis and a reaction mechanism was proposed. The number-average molecular weight was found by gel permeation chromatography technique. On the basis of the calculated value of kinetic chain length, the structure of the resole-type phenolic resin was proposed. Differential scanning calorimetry technique was used to investigate the curing behavior. As assessed by dynamic thermogravimetry, traces of resole sample prepared from p-cresol were found to possess better thermal stability, both in conventional as well as microwave-irradiated systems, among all other resole samples. The tensile strength, elongation at break, and impact strength showed an increasing trend. The main advantage of the process is about sixfold reduction of reaction time of the process carried at microwave reactors in comparison with the conventional heating.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314537538|hwp:master-id:sphip;0954008314537538
      Issue No: Vol. 27, No. 1 (2014)
       
  • Preparation, characterization, and properties of heterocyclic
           polyimide/titania nanocomposite thin films
    • Authors: Sadeghipour, H; Rafiee, Z, Ashouri, D, Ahmadi, A, Mousavian, S, Hekmati, A.
      Pages: 31 - 36
      Abstract: A series of heterocyclic polyimides (PIs) having triazole moieties in their main chain were successfully prepared by the polycondensation of 3,5-diamino-1,2,4-triazole with four dianhydrides (3,3',4,4'-benzophenonetetracarboxylic dianhydride, 1,2,4,5-benzenetetracarboxylic-1,2,4,5-dianhydride, 4,4'-(hexaflouroisopropylidene)diphthalic anhydride, and 1,4,5,8-naphthalenetetracarboxylic dianhydride) via the soluble poly(amic acid) (PAA) precursors. Different amounts of titania (TiO2) nanoparticles were incorporated into the PAA matrix and then thermally imidized to form PI/TiO2. The obtained PAAs exhibited high compatibility with the TiO2 nanoparticles, thereby resulting in highly transparent PI nanocomposite films. The resulting nanocomposites were characterized using Fourier transform infrared spectroscopy, powder X-ray diffraction, transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). TEM results indicated that the nanoparticles were dispersed homogeneously in the PI matrix on nanoscale. TGA confirmed that the heat stability of the nanocomposites was improved in the presence of TiO2 nanoparticles.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314538079|hwp:master-id:sphip;0954008314538079
      Issue No: Vol. 27, No. 1 (2014)
       
  • New aromatic polyamides with 2,6-biphenylpyridyl moieties and
           4-trifluoromethylphenyl pendent groups
    • Authors: Li, X; Jiang, J.-W, Pan, Y, Sheng, S.-R, Liu, X.-L.
      Pages: 37 - 45
      Abstract: A new diamine, 4-(4-trifluoromethylphenyl)-2,6-bis(4-aminophenyl)pyridine, was synthesized and used in the preparation of the fluorinated polyamides with inherent viscosities of 0.67–0.96 dL g–1 by direct polycondensation with aromatic dicarboxylic acids. The obtained polyamides have good solubility in many organic solvents such as N-methyl-2-pyrrolidinone, dimethylacetamide (DMAc), and tetrahydrofuran and exhibited glass transition temperatures between 275°C and 301°C, 10% weight loss temperatures (T d10s) ranging from 502°C to 516°C, and char yields of 51–61% at 800°C under nitrogen atmosphere. Flexible and strong polymer films cast from DMAc solutions showed tensile strengths of 77.4–93.2 MPa, elongations at break of 9.2–14.3%, and initial moduli of 2.06–2.82 GPa. The polymer films also had good dielectric properties with dielectric constants of 3.22–3.50 (1 M Hz) and dissipation factors of 3.20–3.96 x 10–3, and acceptable electrical insulating properties, as well as low water uptake between 1.26% and 1.78%, and high transparency with an ultraviolet–visible absorption cutoff wavelength in the range of 330–371 nm. The remarkable combined features ensure these polymers to be ideal candidate materials for advanced microelectronic industry and other related applications.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314538080|hwp:master-id:sphip;0954008314538080
      Issue No: Vol. 27, No. 1 (2014)
       
  • Surface wettability controllable polyimides bearing long-chain alkyl
           groups via phenyl ester linkages by ultraviolet light irradiation
    • Authors: Tsuda, Y; Nakamura, R, Osajima, S, Matsuda, T.
      Pages: 46 - 58
      Abstract: The novel polyimides and copolyimides are synthesized from the diamines having three long-chain alkyl groups connected by phenyl ester linkages, 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride or diphenylsulfonetetracarboxylic dianhydride as a tetracarboxylic dianhydride, and 4,4’-diaminodiphenylether as a diamine comonomer. These polyimides show good film-forming ability and good thermal properties. The thin films of obtained polyimides were irradiated by ultraviolet (UV) light ( max = 254 nm), and the contact angles for the water decreased from near 100° (hydrophobicity) to near 20° (hydrophilicity) in proportion to irradiated UV light energy. From the result of attenuated total reflectance analysis, it is recognized that the hydrophobic long-chain alkyl groups on the polyimide surface decrease and the hydrophilic groups such as carboxyl groups and hydroxyl groups generate on their surface. Thus, the surface wettability of these polyimides can be controlled by UV light irradiation, and this method is expected to be applied in the field of printed electronics.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314538466|hwp:master-id:sphip;0954008314538466
      Issue No: Vol. 27, No. 1 (2014)
       
  • Synthesis and characterization of novel pyrimidine-containing poly(arylene
           ether)s
    • Authors: Wang Y.
      Pages: 59 - 64
      Abstract: Two novel thermally stable high-performance polymers, poly(arylene ether pyrimidine)s have been prepared with 2,4-dichloropyrimidine and 4,4'-(hexafluoroisopropylidene)diphenol and bisphenol A by nucleophilic displacement reaction, respectively. Gel permeation chromatography results show that the obtained polymers exhibited 20,000 g mol–1 weight-average molecular weight. Thermal analysis studies indicate glass transition temperature values up to 156°C in differential scanning calorimetry and thermogravimetric analysis results revealed outstanding thermal stability up to 430 and 427°C for 5% weight loss under nitrogen and in air atmospheres, respectively. The polymers are soluble in a wide range of organic solvents, such as tetrahydrofuran, chloroform, N-methyl-2-pyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, and toluene at room temperature. The cutoff wavelengths of the resulting polymers were in the range of 278–283 nm.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314538467|hwp:master-id:sphip;0954008314538467
      Issue No: Vol. 27, No. 1 (2014)
       
  • Thermolysis parameter and kinetic research in copolyamide 66 containing
           2-carboxyethyl phenyl phosphinic acid
    • Authors: Sheng-Long, T; Lian-Xin, M, Xiao-Guang, S, Xu-Dong, T.
      Pages: 65 - 73
      Abstract: Polyamide 66 (PA66) containing phosphorus with flame-retardant property (FR-PA66) was synthesized with adipic acid hexamethylene salt and 2-carboxyethyl phenyl phosphinic acid as raw materials. The thermal degradation kinetics of FR-PA66 and PA66 were measured using a thermogravimetric analyzer, and the data obtained were analyzed with Flynn–Wall–Ozawa and Coast–Redfern methods. The results show that the activation energy (E a) of PA66 fabricated under different conditions will be different, while the mechanism functions of thermal decomposition remain the same. Comparing the limit E a value of PA66 with FR-PA66 at different stages of thermolysis, FR-PA66 keeps the initial thermolysis E a almost unchanged, reduces the middle thermolysis E a to 139.1 kJ mol–1, and increases the last thermolysis E a to 454 kJ mol–1, that is 223 kJ mol–1 higher than that of PA66 with 231 kJ mol–1. This result may be explained by the first cleavage of P–C bond and the formation of the carbonized protective layer. In addition, the most probable kinetic mechanism functions (F(α)) of thermolysis of FR-PA66 in three different stages were when the rate of decomposition (α) is lower than 0.4, F(α) = –ln(1 – α); when α is between 0.4 and 0.65, F(α) = [–ln(1 – α)]; and when α is beyond 0.65, F(α) = [–ln(1 – α)].
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314539358|hwp:master-id:sphip;0954008314539358
      Issue No: Vol. 27, No. 1 (2014)
       
  • Synthesis and characterization of a liquid oxygen-compatible epoxy resin
    • Authors: Wu, Z; Li, S, Liu, M, Wang, Z, Li, J.
      Pages: 74 - 84
      Abstract: The bromine element was introduced into an epoxy resin to improve the liquid oxygen compatibility of the epoxy resin. After curing using 4,4'-diamino diphenylmethane, the liquid oxygen compatibility of all specimens was measured by the liquid oxygen mechanical impact test (ASTM D2512-95). The results suggested that the bromine-modified epoxy resin (BEP) was compatible with liquid oxygen, whereas the bisphenol F epoxy resin (EP) had poor liquid oxygen compatibility. The results of thermogravimetric analysis indicated that the incorporation of tetrabromobisphenol A into EP could accelerate the second-stage thermal degradation of BEP, leading to improvement of the liquid oxygen compatibility. X-ray photoelectron spectroscopy analysis indicated that the C–C/H groups on the surface of specimens could be oxidized to C–O–H/C and C=O groups during the impact process. The mechanism of bromine enhancement on the liquid oxygen compatibility of epoxy resin is proposed.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314539359|hwp:master-id:sphip;0954008314539359
      Issue No: Vol. 27, No. 1 (2014)
       
  • High-performance polymer nanocomposites having a biosafe amino acid by
           
    • Authors: Mallakpour, S; Mani, L.
      Pages: 85 - 93
      Abstract: A lot of polymeric materials are flammable, requiring modification to decrease their flammability. Nanoparticle (NP) fillers are very attractive for this purpose as they can improve both the physical and the flammable properties of the nanocomposites (NCs). Zirconium oxide (ZrO2) is one of the NPs having flame-retardant property. For the first time, ZrO2 NPs were modified using a fire-resistant modifier and then the chiral NCs were prepared via incorporating modified ZrO2-NPs into the poly(amide–imide) matrix. By decreasing the flammability of these NCs, severe aggregation of ZrO2-NPs could be reduced by surface modification. The surface modification of ZrO2 and the synthesis of NCs were performed through ultrasonic irradiations. The resulting modified ZrO2 and NPs-reinforced composites were characterized by different analyses. Field-emission scanning electron microscopy and transmission electron microscopy results proved that ZrO2-NPs were homogeneously distributed after the surface modification and successfully incorporated into the PAI matrix. The grafting of modifier on the surface of ZrO2 was confirmed by thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy techniques. TGA also showed high thermally stable and flame-retardant properties of the obtained NCs.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314539361|hwp:master-id:sphip;0954008314539361
      Issue No: Vol. 27, No. 1 (2014)
       
  • Oxidation degradation of polyphenylene sulfide needle felt at different
           sulfuric acid dew point temperatures
    • Authors: Cai, W; Hu, G.
      Pages: 94 - 99
      Abstract: Sulfuric acid dew point is an important parameter in coal-fired power plants as it affects many equipments, materials, and pipes, including filter bags. This article puts forward a new method to test the effect of different sulfuric acid dew points on the performance of polyphenylene sulfide (PPS) needle felt. Oxidation reaction mechanisms were predicted using Fourier transform infrared analysis. The results show that the degradation starts with S atoms in the PPS molecular chain; first, the thioether bond is broken, followed by sulfonation of benzene, and finally concluding with the carbonization of PPS. Furthermore, PPS thermal properties also show a decrease in the melting temperatures and thermal decomposition temperatures as well as an increase in the residual mass of the initial weight with increasing sulfuric acid dew point. Changes in the thermal properties of PPS further confirmed that different reaction mechanisms exist under different acid dew points.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314540311|hwp:master-id:sphip;0954008314540311
      Issue No: Vol. 27, No. 1 (2014)
       
  • Synthesis of boehmite and its effect on flame retardancy of epoxy resin
    • Authors: Sun, T; Zhuo, Q, Chen, Y, Wu, Z.
      Pages: 100 - 104
      Abstract: In the present work, a facile and environmentally friendly method was presented to synthesize nano-boehmite (AlOOH) that was added in bisphenol A epoxy resin to improve the flame retardancy of the resin. The crystalline phase of the as-synthesized AlOOH was examined using X-ray diffraction measurements, while no peaks from the other phase are observed in patterns, and the sharp peaks demonstrate the high crystallinity of AlOOH. Scanning electron microscopy was used to observe the morphology of AlOOH; the results indicate that the thickness of the as-synthesized AlOOH nanosheets is about 23 nm. The thermogravimetric analysis of neat epoxy resin and AlOOH/epoxy nanocomposites with different contents of AlOOH (2.3%, 4.7%, 5.6%, and 10.2%, respectively) shows that the decomposition temperature of AlOOH/epoxy nanocomposites increases compared with the neat epoxy; a significant improvement in mass loss rate is observed when the content of AlOOH reaches 10.2%. The glass transition temperatures (T gs) of nanocomposites were measured by differential scanning calorimetry; the results indicate that when the content of AlOOH in epoxy resins increases to 10.2%, the T gs of AlOOH/epoxy nanocomposites can increase from 165.2°C to 181.4°C. Oxygen index test was used to investigate the flame retardancy properties of AlOOH/epoxy nanocomposites; the results obtained from these measurements further reflect the facts that AlOOH can improve the flame retardancy and T g of epoxy resin.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314540312|hwp:master-id:sphip;0954008314540312
      Issue No: Vol. 27, No. 1 (2014)
       
  • Polyaniline-coated nylon lycra fabrics for strain sensor and
           electromagnetic interference shielding applications
    • Authors: Muthukumar, N; Thilagavathi, G, Kannaian, T.
      Pages: 105 - 111
      Abstract: In this article, a conductive polyaniline-coated nylon lycra fabric has been characterized for electromagnetic interference (EMI) shielding and strain sensor application. The conductive fabric is fabricated by in-situ polymerization of polyaniline on the nylon lycra fabric at low temperature. Characterization has been carried out using scanning electron microscopy and differential scanning calorimetry. The sensitivity of the developed fabric sensor is characterized using Zwick tensile tester. EMI shielding efficiency (SE) of the developed fabrics is carried out as per ASTM D4935 standard. The stability of the developed sensor is characterized with respect to temperature and humidity using Programmable Environmental Test Chamber. The measurement of the conductivity change with strain shows that the fabrics so prepared exhibits high strain sensitivity, while its good stability is indicated by a small loss of conductivity after the thermal and humidity ageing tests and supported by the slight change in conductivity over storage of 90 days. The sensor measures flexion angle of elbow up to 120° angle. The electromagnetic shielding tests show that the developed conductive fabric has the EMI SE of 26 dB in the frequency range of 8–12 GHz.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314540313|hwp:master-id:sphip;0954008314540313
      Issue No: Vol. 27, No. 1 (2014)
       
  • Preparation, characterization, and properties of poly(thioether ether
           imide)s from isomeric bis(chlorophthalimide)s and bis(4-mercaptophenyl)
           ether
    • Authors: Liu, J; Chen, G, Fang, X.
      Pages: 112 - 121
      Abstract: A series of isomeric poly(thioether ether imide)s (PTEIs) containing both thioether and ether linkages were prepared by aromatic nucleophilic substitution reaction of isomeric bis(chlorophthalimide)s (BCPIs) with bis(4-mercaptophenyl) ether (BMPE). The inherent viscosities of synthesized polymers were found in the range of 0.41–0.86 dL g–1 in N-methyl-2-pyrrolidone at 30°C. The glass transition temperature (T g) of the isomeric PTEIs were 210–242°C and increased by increasing the content of 3-substituted phthalimide unit in the polymer backbone. The 5% weight loss temperature values reached up to 525–539°C under nitrogen and 523–534°C in air atmospheres, respectively, which indicated this kind of polyimide possessed excellent thermal stability. Flexible films could be cast from the polymer solution. The PTEI films exhibited moderate mechanical properties with tensile strengths of 106–127 MPa, elongations at break of 8.6–11.5%, and tensile moduli of 2.2–2.8 GPa, respectively. Dynamic mechanical thermal analysis results illustrated that the storage moduli (E') of PTEI (a–e) almost completely maintained at about 2.3 GPa before reaching the corresponding T g. It is noted that the minimum melt viscosity of isomeric PTEIs (a'–e') decreased by increasing the content of unsymmetrical 3,4'-substituted phthalimide unit in the polymer main chain.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314540925|hwp:master-id:sphip;0954008314540925
      Issue No: Vol. 27, No. 1 (2014)
       
  • Exploration of novel heat and flame-resistant
           poly(urethane-imide)/functional layered silicate-based foams
    • Authors: Kausar A.
      Pages: 122 - 131
      Abstract: Poly(urethane–imide) (PUI)/hydroxyl functional montmorillonite (MMT; H-MMT) nanocomposites and foams have been prepared with modified layered silicates (hydroxyl-modified H-MMT) via in situ polymerization. The physical properties of PUI/H-MMT nanocomposites and foams were investigated and were found to be dependent on the structure of polyurethane, functional groups of the modifiers, and chemical reaction between the hydroxyl of H-MMT and matrix. Field-emission scanning electron microscopy revealed imprecise honeycomb cellular structure with increased cell density and reduced cell size compared with pure PUI foam. Compression strength and modulus of PUI/H-MMT 1 foam (1 wt% nanofiller) were 26.5 MPa and 4 GPa, respectively, which were augmented to 31 MPa and 7 GPa in PUI/H-MMT 5 foam (5 wt% nanofiller). Thermogravimetric results for 10% thermal decomposition temperature of PUI/H-MMT 1–5 foams were in the range of 476–511°C. Dynamic mechanical thermal analysis showed that PUI/H-MMT 1 foam had glass transition temperature of 155°C which was enhanced to 161°C in PUI/H-MMT 5 foam. Limiting oxygen index and UL 94 results showed that PUI/H-MMT 1–5 foams exhibited enhanced nonflammability (V-0 rating) with the clay loading.
      PubDate: 2014-12-31T01:51:50-08:00
      DOI: 10.1177/0954008314540926|hwp:master-id:sphip;0954008314540926
      Issue No: Vol. 27, No. 1 (2014)
       
 
 
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