Journal of Polymer Science, Part B: Polymer Physics

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Sulfonated poly(ether ether ketone)/poly(vinylpyrrolidone) acid–base polymer blends for direct methanol fuel cell application
Journal of Polymer Science, Part B: Polymer Physics - Tập 44 Số 3 - Trang 565-572 - 2006
Han‐Lang Wu, M. Chen‐Chi, Hsu‐Chiang Kuan, Chung‐Hao Wang, Chih‐Yuan Chen, Chin‐Lung Chiang
AbstractAcid–base polymer blends for polymer electrolyte membranes have been prepared by blending sulfonated poly(ether ether ketone) (SPEEK) with poly(vinylpyrrolidone) (PVP) to reduce methanol uptake and to decrease methanol permeability while maintaining high proton conductivity. The acid‐base interaction occurring on the sulfonic acid group and on the tertiary amide group was characterized by ... hiện toàn bộ
Effect of flocculated structure on rheology of poly(butylene terephthalate)/clay nanocomposites
Journal of Polymer Science, Part B: Polymer Physics - Tập 43 Số 19 - Trang 2807-2818 - 2005
Defeng Wu, Chixing Zhou, Wei Yu, Fan Xie
AbstractThe microstructure and rheological property of poly(butylene terephthalate) (PBT)/epoxy/montmorillonite nanocomposites (PCNs) were investigated. For the study, PCNs were prepared by melt intercalation in clay content of 4 wt % and, epoxy loadings were varied from 2 to 4 wt %. The intercalated PCNs are characterized by different techniques such as transmission electron microscopy, Fourier t... hiện toàn bộ
FTIR analysis of hydrogen bonding in amorphous linear aromatic polyurethanes. II. Influence of styrene solvent
Journal of Polymer Science, Part B: Polymer Physics - Tập 32 Số 8 - Trang 1315-1320 - 1994
Fu Cai Wang, M Feve, T. M. Lam, Jean‐Pierre Pascault
AbstractFourier‐transform infrared (FTIR) spectral studies were carried out on a polyurethane in styrene solutions at styrene concentrations from 30 to 90% (w/w). NH vibrations were studied in the stretching and bending regions. The results demonstrated that the NH groups of the polyurethane can hydrogen bond not only with the CO groups but also with other groups in this system. The investigati... hiện toàn bộ
Effect of acidification treatment and morphological stability of sulfonated poly(arylene ether sulfone) copolymer proton‐exchange membranes for fuel‐cell use above 100 °C
Journal of Polymer Science, Part B: Polymer Physics - Tập 41 Số 22 - Trang 2816-2828 - 2003
Yu Seung Kim, Feng Wang, Michael A. Hickner, Stephan Mccartney, Young Taik Hong, William Harrison, Thomas A. Zawodzinski, James E. McGrath
AbstractDirectly copolymerized wholly aromatic sulfonated poly(arylene ether sulfone) copolymers derived from 4,4′‐biphenol, 4,4′‐dichlorodiphenyl sulfone, 3,3′‐disulfonated, and 4,4′‐dichlorodiphenyl sulfone (BPSH) were evaluated as proton‐exchange membranes for elevated temperature operation (100–140 °C). Acidification of the copolymer from the sulfonated form after the nucleophilic step (conden... hiện toàn bộ
Influence of chemical composition and sequence length on the transport properties of proton exchange membranes
Journal of Polymer Science, Part B: Polymer Physics - Tập 44 Số 16 - Trang 2226-2239 - 2006
Abhishek Roy, Michael A. Hickner, Xiang Yu, Yanxiang Li, Thomas E. Glass, James E. McGrath
AbstractOne of the integral parts of the fuel cell is the proton exchange membrane. Our research group has been engaged in the past few years in the synthesis of several sulfonated poly(arylene ether) random copolymers. The copolymers were varied in both the bisphenol structure as well as in the functional groups in the backbone such as sulfone and ketones. To compare the effect of sequence length... hiện toàn bộ
Molecular design of functional polymer surfaces
Journal of Polymer Science, Part B: Polymer Physics - Tập 42 Số 16 - Trang 2942-2956 - 2004
Jeffrey T. Koberstein
AbstractThree design principles are presented that allow for the molecular design of functional polymer surfaces: surface segregation, surface structure, and surface reorganization. These design principles are illustrated by a description of the behavior of model end‐functional polymers that accurately reflect the general behavior of essentially all possible linear functional polymer architectures... hiện toàn bộ
Annealing induced microstructure and fracture resistance changes in isotactic polypropylene/ethylene‐octene copolymer blends with and without β‐phase nucleating agent
Journal of Polymer Science, Part B: Polymer Physics - Tập 48 Số 20 - Trang 2108-2120 - 2010
Xiaoxi Li, Haiyan Wu, Liang Han, Ting Huang, Yong Wang, Hongwei Bai, Zuowan Zhou
AbstractPrevious work showed that annealing induced the great improvement of fracture resistance of β‐iPP, relating to the decreased number of chain segments in the amorphous region. To further prove the rationality of this observation, in this work, the ethylene‐octene copolymer (POE) toughened isotactic polypropylene (iPP) blends with or without β‐phase nucleating agent (β‐NA) were adopted and t... hiện toàn bộ
Surface energetics, dispersion, and nanotribomechanical behavior of POSS/PP hybrid nanocomposites
Journal of Polymer Science, Part B: Polymer Physics - Tập 45 Số 17 - Trang 2441-2455 - 2007
Rahul Misra, Bruce X. Fu, Sarah E. Morgan
AbstractHybrid organic–inorganic polymer nanocomposites incorporating polyhedral oligomeric silsesquioxane (POSS) nanoparticles are of increasing interest for high performance materials applications. Octaisobutyl POSS/polypropylene nanocomposites were prepared at varying POSS concentrations via melt blending. The interplay of POSS molecular geometry, composition, and concentration in relation to t... hiện toàn bộ
The POSS side chain epoxy nanocomposite: Synthesis and thermal properties
Journal of Polymer Science, Part B: Polymer Physics - Tập 48 Số 6 - Trang 643-652 - 2010
Yie‐Chan Chiu, Linawati Riang, I-Hsuan Chou, M. Chen‐Chi, Chin‐Lung Chiang, C.C. Yang
AbstractThe IPI‐POSS‐modified epoxy resin (IPEP) was prepared from isocyanato‐propyldinethylsilyl‐isobutyl‐POSS (IPI‐POSS) and diglycidyl ether of bisphenol A epoxy resin. The steric hindrance of the IPEP bulky POSS side chain improved the curing activation energies. The POSS particles sizes were about 2–3 nm and dispersed uniformly. At lower IPEP concentration (POSS < 12 wt %), the glass transiti... hiện toàn bộ
POSS‐nylon 6 nanocomposites: Influence of POSS structure on surface and bulk properties
Journal of Polymer Science, Part B: Polymer Physics - Tập 47 Số 11 - Trang 1088-1102 - 2009
Rahul Misra, Bruce X. Fu, Andreas Plagge, Sarah E. Morgan
AbstractHybrid organic/inorganic nanocomposites based on polyhedral oligomeric silsesquioxane (POSS) nanostructured chemicals and nylon 6 were prepared via melt mixing. Two structurally and chemically different POSS molecules, a closed cage, nonpolar octaisobutyl POSS (Oib‐POSS) and an open cage, polar trisilanolphenyl POSS (Tsp‐POSS) with differing predicted solubility parameters were evaluated i... hiện toàn bộ
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