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  Subjects -> ENGINEERING (Total: 2070 journals)
    - CHEMICAL ENGINEERING (171 journals)
    - CIVIL ENGINEERING (161 journals)
    - ELECTRICAL ENGINEERING (88 journals)
    - ENGINEERING (1148 journals)
    - ENGINEERING MECHANICS AND MATERIALS (320 journals)
    - HYDRAULIC ENGINEERING (52 journals)
    - INDUSTRIAL ENGINEERING (52 journals)
    - MECHANICAL ENGINEERING (78 journals)

CHEMICAL ENGINEERING (171 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: 9)
Advanced Powder Technology     Hybrid Journal   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 17)
Advances in Chemical Engineering and Science     Open Access   (Followers: 23)
Advances in Polymer Technology     Hybrid Journal   (Followers: 11)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 5)
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: 3)
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: 4)
Chemical and Materials Engineering     Open Access   (Followers: 1)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 9)
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: 3)
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 Research Bulletin     Open Access  
Chemical Engineering Science     Hybrid Journal   (Followers: 13)
Chemical Geology     Hybrid Journal   (Followers: 10)
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: 343)
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: 250)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
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   (Followers: 1)
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: 3)
International Journal of Chemical and Petroleum Sciences     Open Access   (Followers: 2)
International Journal of Chemical Engineering     Open Access   (Followers: 7)
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: 3)
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: 13)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 220)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 11)
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)

        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  [757 journals]
  • Novel reverse-selective poly(2,5-benzimidazole) derivatives for
           membrane-based gas separation
    • Authors: Jiang, C; Jie, X, Wang, L, Cheng, Y, Liu, D, Liu, J, Cao, Y.
      Pages: 135 - 144
      Abstract: Three novel polymers were synthesized by introducing hexyl, dodecyl, and octadecyl groups to the side chains of poly (2,5-benzimidazole) (ABPBI). Fourier transform infrared, thermal stability, and mechanical strength tests were applied to characterize the three polymers. Elemental analysis was also carried out to determine the degree of substitution. Gas permeation behavior of the three derivative membranes was investigated with pure gas, including hydrogen (H2), nitrogen (N2), oxygen, methane, and carbon dioxide (CO2). The results show that except the hexyl-substituted ABPBI the other two polymers are reverse selective because in both polymers CO2 has a higher permeability than H2. Among the three derivatives, octadecyl-modified ABPBI shows the best permselectivity of gas pairs, such as CO2/N2 (approximately 13) and CO2/H2 (approximately 2.8), with a quite high CO2 permeability (approximately 100 barrer) at 35°C and 3.0 atm.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314541709
      Issue No: Vol. 27, No. 2 (2015)
       
  • Effects of polyarylene sulfide sulfone on the mechanical properties of
           glass fiber cloth-reinforced polyphenylene sulfide composites
    • Authors: Liu, Z; Zhang, S, Huang, G, Zhang, K, Wang, X, Zhang, G, Long, S, Yang, J.
      Pages: 145 - 152
      Abstract: In this article, polyphenylene sulfide (PPS)/polyarylene sulfide sulfone (PASS) was melt blended and PPS/PASS/glass fiber cloth (GFC) composite was prepared. Mechanical testing and dynamic mechanical analysis DMAof PPS/PASS blends and PPS/PASS/GFC composites were performed to inspect the effects of PASS on the mechanical properties of the composites. With the presence of PASS, the strength and modulus of the PPS/PASS blends declined to some extent, while the strength and modulus of the PPS/PASS/GFC composites increased. The results indicate that the addition of PASS is beneficial for strengthening the interaction between PPS and GFC. The scanning electron microscopy results of the impact fracture surfaces of composites were also consistent with the data of mechanical properties.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314541789
      Issue No: Vol. 27, No. 2 (2015)
       
  • Nitrile butadiene rubber-based heat-shielding insulations for solid rocket
           motors: Effect of polyimide fibrous reinforcement on the morphology and
           properties
    • Authors: Zhao, Y; Hu, S, Liu, W, An, G, Wu, Z, Wu, D, Jin, R.
      Pages: 153 - 160
      Abstract: Chopped polyimide (PI) fiber-filled nitrile butadiene rubber (NBR) insulations for solid rocket motors were fabricated by surface modification of chopped PI fibers treated under oxygen plasma and subsequently by mixing formulation of NBR insulations on a two-roll mill. The effects of chopped PI fibers’ surface modification on the mechanical and ablative properties were investigated. Results showed that excellent mechanical and ablative properties of the NBR insulations were attributable to the high thermal stability and unique interfacial interactions between fiber and the matrix because of the rougher surface character of modified chopped PI fibers. The microstructures of insulation and ablated charred layers were also characterized by scanning electron microscopy and atomic force microscopy.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314541819
      Issue No: Vol. 27, No. 2 (2015)
       
  • Nanostructured poly(2,2'-bithiophene-co-3,4-ethylenedioxythiophene):
           Synthesis, characterization, and properties
    • Authors: Massoumi, B; Alipour, N, Fathalipour, S, Jaymand, M.
      Pages: 161 - 170
      Abstract: This article describes the synthesis and characterization of poly(2,2'-bithiophene) (PBT), poly(3,4-ethylenedioxythiophene) (PEDOT), and poly(2,2'-bithiophene-co-3,4-ethylenedioxythiophene) (P(BT-co-EDOT)) copolymers via chemical and electrochemical oxidation polymerization methods. The P(BT-co-EDOT) nanoparticles made of conjugated polymers with different feed ratios of monomers were synthesized by chemical polymerization in the presence of anhydrous ferric chloride and mixtures of acetonitrile (CH3CN) and dichloromethane as a binary organic solvent. The polymers obtained were characterized by means of Fourier transform infrared and ultraviolet–visible spectroscopy, and their thermal behaviors were examined by thermogravimetric analysis. The electrical conductivity of the samples was measured using samples in which the conductive materials were sandwiched between two nickel electrodes at room temperature. The surface morphology and crystallinity of the synthesized samples were observed by scanning electron microscopy and X-ray diffractometer, respectively. In electrochemical method, copolymer thin films were prepared with different feed ratios of monomers by cyclic voltammetry in an CH3CN-tetrabutheylamonium perchlorate solvent–electrolyte couple on the surface of the glassy carbon microelectrode as the working electrode. Deposition conditions and influence of the molar ratios of monomers on the electroactivity were investigated under cyclic voltammetric conditions.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314541821
      Issue No: Vol. 27, No. 2 (2015)
       
  • The thermal properties and cure kinetics of polytriazole resin modified by
           4,4'-bis(azidomethyl) biphenyl
    • Authors: Xue, S; Zhang, Q.
      Pages: 171 - 176
      Abstract: 4,4'-Bis(azidomethyl)biphenyl (BAMBP) was employed to modify the polytriazole resin. The thermal properties and cure kinetics of the modified polytriazole resin were investigated using differential scanning calorimetry, dynamic mechanical analysis, and thermogravimetric analysis. Results indicate that BAMBP can promote the curing reaction and decrease the curing reaction temperature but cannot change the cure reaction mechanism. The highest glass transition temperature of modified polytriazole resin can be obtained with 5 wt% BAMBP at 213.2°C. Furthermore, the excellent solubility characteristics of BAMBP in polytriazole allows for fabricating T700 carbon fiber/polytriazole composites, which makes polytriazole one of the candidate resins cured at a lower temperature but used at a higher temperature.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314542472
      Issue No: Vol. 27, No. 2 (2015)
       
  • Toughening epoxy resins by modification with in situ polymerized acrylate
           copolymer composed of butyl acrylate and glycidyl methacrylate
    • Authors: Wang, T; Wang, J, Chen, W, Duan, H, Xiao, H, Wang, J, Yang, J.
      Pages: 177 - 182
      Abstract: Poly(butyl acrylate–glycidyl methacrylate) (PBG) was prepared by in situ polymerization of butyl acrylate (BA) and glycidyl methacrylate (GMA) and further used as a modifier to improve the comprehensive properties of the epoxy resin curing system. The modified resin system was based on diglycidyl ether of bisphenol, methyl tetrahydrophthalic anhydride, and tris(dimethylaminomethyl)phenol. The influence of copolymer composition on the mechanical properties, thermal performance, and phase behavior of the system was carefully examined. Results showed that the addition of PBG greatly improved the impact strength of the modified epoxy resin. When 15 wt% of the BA/GMA with a weight ratio composition of 7.5/7.5 was added to the epoxy, high-performance-modified epoxy resin was obtained.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314542473
      Issue No: Vol. 27, No. 2 (2015)
       
  • Preparation of aliphatic-aromatic polyimide particles by polycondensation
           of diethyl hexafluoroisopropylidenediphthalate and diaminooctane in
           ethylene glycol
    • Authors: Namikoshi, T; Odahara, K, Wakino, A, Murata, M, Watanabe, S.
      Pages: 183 - 190
      Abstract: Polycondensation of nylon salt-type monomer composed of diethyl hexafluoroisopropylidenediphthalate and diaminooctane was performed at 130°C in ethylene glycol to form confetti-shaped particles. Before the polycondensation, the salt monomer solution was homogeneous. As the polycondensation proceeded, the solution became turbid and polyimide particles grew to around 7 μm for 8 h. After the polycondensation, small particles precipitated and got deposited onto large particles to form confetti-shaped particles. Rod-shaped particles were also formed by the polycondensation at low monomer concentration in a long reaction time. They were found to be crystalline in form.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314542474
      Issue No: Vol. 27, No. 2 (2015)
       
  • Synthesis of mica-multiwalled carbon nanotube (MWCNT) hybrid material and
           properties of mica-MWCNT/epoxy composites coating research
    • Authors: He, Y; Fan, Y, Chen, C, Zhong, F, Qing, D.
      Pages: 191 - 199
      Abstract: Multiwalled carbon nanotubes (MWCNTs) were acidified by mixed acid, and mica was modified with a silane coupling agent (KH560). Hexamethylenediamine was used to connect mica and MWCNTs, and mica-MWCNTs hybrid materials were obtained. The result of cladding was verified through X-ray diffraction (XRD) and scanning electron microscopy (SEM). Composites coated with mica-MWCNTs/epoxy resin, mica/epoxy resin, and pure epoxy were prepared separately. Impedance performance was tested through an electrochemical workstation, and SEM was used to observe the surface condition of the coatings. Thermogravimetric analysis–differential thermogravimetry (TGA-DTG) was used to characterize the thermal stability of the composite coating. The results show that MWCNTs can be well dispersed on the surface of mica when 10% KH560 is added. The composite coating of mica-MWCNTs/epoxy has larger impedance compared with those of the mica/epoxy and pure epoxy. The anticorrosion property of the mica-MWCNTs composite coating increased greatly though SEM, and the thermal degradation rate of composites decreased after coating with CNTs.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314542475
      Issue No: Vol. 27, No. 2 (2015)
       
  • Synthesis and characterization of new poly(aryl ether ketone)s bearing
           (4-phenoxyphenyl)triphenylmethane moieties
    • Authors: Li, X; Jiang, J.-W, Yu, L.-M, Liu, X.-L, Sheng, S.-R.
      Pages: 200 - 206
      Abstract: 1,1-Bis(4-hydroxyphenyl)-1-(4-phenoxyphenyl)-1-phenylmethane (BHPPPPM), a new bisphenol monomer, was synthesized with 65% yield from 4-benzoyl diphenyl ether in a one-pot, two-step synthetic procedure. Four new poly(aryl ether ketone)s (PAEKs) bearing (4-phenoxyphenyl)triphenylmethane moieties were prepared from BHPPPPM with four difluorinated aromatic ketones via a nucleophilic substitution reaction. The polycondensation proceeded in tetramethylene sulfone in the presence of anhydrous potassium carbonate and afforded the new PAEKs in nearly quantitative yields with inherent viscosities of 0.60–0.78 dL g–1. The resulting PAEKs having number-average molecular weights in the range of 29,500–34,200 g mol–1 with the polydispersity index ranged from 1.94 to 2.01 are all amorphous and show high glass transition temperatures ranging from 174°C to 196°C, excellent thermal stability, and the temperatures at the 5% weight loss are over 500°C with char yields above 60% at 700°C under nitrogen atmosphere. These new PAEKs are all soluble in polar aprotic solvents such as N-methyl-2-pyrrolidone and N,N'-dimethylacetamide and could also be dissolved in chloroform and tetrahydrofuran. All the polymers formed transparent, strong, and flexible films with tensile strengths of 78–85 MPa, tensile moduli of 1.9–2.4 GPa, and elongations at break of 7–10%.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314543119
      Issue No: Vol. 27, No. 2 (2015)
       
  • Structural-controlled synthesis of polyaniline nanoarchitectures using
           hydrothermal method
    • Authors: Zhu, X; Hou, K, Chen, C, Zhang, W, Sun, H, Zhang, G, Gao, Z.
      Pages: 207 - 216
      Abstract: Three new polyaniline (PANI) micro/nanostructures featuring square nanosheets, microspheres and microdisks are successfully synthesized via hydrothermal method. Uniform sizes and thickness of highly crystalline PANI square structural nanosheets can be tuned by the oxidation polymerization in the presence of cetyltrimethylammonium bromide (CTAB) as a template. Mechanistic studies indicate that concentrations of aniline and CTAB, reaction temperature and time have great influence on the morphology of PANI polymers. Particularly, CTAB is essential to determine the morphology of synthetic PANI. In aqueous solution at extremely high temperature and pressure, CTAB provides various self-assembly of micelles, such as spherical micelle, planar bilayer, and lamellar phase, in which corresponding micro/nanostructures are formed. This hydrothermal fabrication gives an excellent example for the preparation of well-defined two-dimensional PANI micro/nanomaterials and potentially for other synthetic polymers.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314543291
      Issue No: Vol. 27, No. 2 (2015)
       
  • Triphenylbenzene core based dendritic benzoxazines and their
           heat-resistant and photoluminescent polymers
    • Authors: Zhu, C; Xu, H, Geng, P, Lu, Z.
      Pages: 217 - 225
      Abstract: A facile and efficient synthetic route to connect 1,3,5-tri(p-hydroxyl-phenyl)benzene (TP) molecules into polymers was introduced. Specifically, a series of triphenylbenzene core based dendritic benzoxazines were synthesized via Mannich reaction using TP, paraformaldehyde, and amine derivatives including n-propylamine, cyclohexylamine, and aniline. The chemical structure of benzoxazines was characterized by nuclear magnetic resonance spectroscopy (proton and carbon nuclear magnetic resonance) and Fourier transform infrared spectroscopy. Thermally ring-opening polymerization of the dendritic benzoxazines yielded the cross-linked polymers. We found that N-substituents had the significant influence on polymerization temperature, glass transition temperature (T g), thermal stability, and char yield. Polybenzoxazine with the N-phenyl group exhibited the highest T g of 276°C, char yield of 70%, and excellent thermal stability (5 and 10% weight loss temperatures at 356 and 411°C, respectively). Photoluminescent analysis indicated that the cross-linked structure did not quench the triphenylbenzene’s photoluminescence, while only the relative photoluminescent intensity of polybenzoxazines reduced compared with TP.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314544339
      Issue No: Vol. 27, No. 2 (2015)
       
  • Synthesis and characterization of novel cross-linking light-emitting
           polyfluorene derivatives
    • Authors: Zhou, S; Jia, D, Liu, J.
      Pages: 226 - 232
      Abstract: Polyfluorene derivative with amine side groups, namely, P1 was synthesized by the palladium-catalyzed coupling reaction of 2,5-dibromoaniline with 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9'-dioctylfluorene. Cross-linked polyazomethine P1-TPD (cross-linked polymer, P1/ terephthalic aldehyde) was obtained by the reaction of P1 with terephthalic aldehyde. Given that replacement of the phenylene ring by a thiophene ring can improve -electron delocalization, we also synthesized P1-TPCD (cross-linked polymer, P1/ 2,5-thiophenedicarboxaldehyde) whose cross-linking bridge was a thiophene ring. The ultraviolet–visible spectra of P1-TPD showed that there was a little hypsochromic shift to its pristine polymer P1, however, the maximum emission wavelength was changed to the second peak in the photoluminescence spectra. Besides, the band gap energy (E g) of P1-TPD was a little narrower than that of P1. The maximum absorption wavelength and the maximum emission wavelength of P1-TPCD was almost the same with P1, but its E g was narrower than P1 and P1-TPD. Most notably, azomethine-linked P1-TPD and P1-TPCD were fluorescent with measured fluorescent quantum yields of 22% and 44%.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314544340
      Issue No: Vol. 27, No. 2 (2015)
       
  • Influence of organic-modified iron-montmorillonite on smoke-suppression
           properties and combustion behavior of intumescent flame-retardant epoxy
           composites
    • Authors: Chen, X; Liu, L, Zhuo, J, Jiao, C, Qian, Y.
      Pages: 233 - 246
      Abstract: In this article, the influence of organic-modified montmorillonite (Fe-OMT) on smoke-suppression properties and combustion behavior of flame-retardant epoxy (FREP) was investigated intensively. A series of intumescent FREPs (IFREPs) with different content of Fe-OMT were prepared based on EP resin as matrix resin, ammonium polyphosphate and pentaerythrite as intumescent flame retardants, and Fe-OMT as smoke suppressant and flame-retardant synergism. Then, the smoke-suppression properties of Fe-OMT on IFREP composites were evaluated using cone calorimeter test, smoke density test, and scanning electron microscopy analysis. The influence of Fe-OMT on thermal degradation of IFREP composites were studied by thermogravimetric analysis–infrared spectrometry in a flowing nitrogen atmosphere. The pyrolysis kinetics of the composites was investigated using Kissinger and Flynn–Wall–Ozawa methods. The results showed that the heat release rate and smoke production rate of flame-retardant samples decrease greatly with the increasing Fe-OMT content. Fe-OMT can enhance char residues of flame-retardant samples and decrease the smoke production rate.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314544341
      Issue No: Vol. 27, No. 2 (2015)
       
  • Synthesis of soluble polyimides based on ether-linked cyclohexyldiamine
           and their ultraviolet shielding behavior
    • Authors: Revathi, R; Prabunathan, P, Devaraju, S, Alagar, M.
      Pages: 247 - 253
      Abstract: A series of polyimides (PIs) based on ether-linked cyclohexyldiamine were prepared using pyromellitic dianhydride (PI-1), benzophenone dianhydride (PI-2), naphthalene dianhydride (PI-3), and perylene dianhydride (PI-4) in 1-methyl-2-pyrrolidone (NMP) medium to obtain respective polyamic acids and are subsequently converted into PIs through thermal imidization. The resulting PIs were characterized by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, and impedance analyses. In addition, the ultraviolet (UV) shielding ability of PIs was also studied and discussed. The vibrational analysis confirms the imidization, and the XRD profile indicates the amorphous nature of the resulting PIs. The PIs synthesized in the present work exhibit good solubility in organic solvents such as NMP, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO). The PI-4-based imide possesses very good solubility with the highest glass transition temperature value of 256°C, highest char yield of 50.16%, highest dielectric constant of 3.9 and higher UV shielding performance of 89% than those of other PIs. Further, the good solubility also makes them useful for coating applications in aerospace and liquid crystal displays.
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008314544342
      Issue No: Vol. 27, No. 2 (2015)
       
  • Thanks to reviewers
    • Pages: 254 - 256
      PubDate: 2015-02-24T03:55:01-08:00
      DOI: 10.1177/0954008315574609
      Issue No: Vol. 27, No. 2 (2015)
       
 
 
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