Journal of Polymer Science, Part B: Polymer Physics

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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 af...... 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...... hiện toàn bộ
Crystallization behavior and morphological development of isotactic polypropylene blended with nanostructured polyhedral oligomeric silsesquioxane molecules
Journal of Polymer Science, Part B: Polymer Physics - Tập 44 Số 15 - Trang 2122-2134 - 2006
Jean‐Hong Chen, Yan-Kai Chiou
AbstractThe thermal properties and morphological development of isothermally crystallized isotactic polypropylene (iPP) blended with nanostructured polyhedral oligomeric silsesquioxane (POSS) molecules at very small loading of POSS were studied with differential scanning calorimeter (DSC), thermal gravimetric analysis, dynamic mechanical analysis, polarized optical...... hiện toàn bộ
The influence of solid‐state microstructure on the origin and yield of long‐lived photogenerated charge in neat semiconducting polymers
Journal of Polymer Science, Part B: Polymer Physics - Tập 50 Số 1 - Trang 27-37 - 2012
Ruipeng Li, Jennifer A. Nekuda Malik, Gianluca Latini, Smita Dayal, Nikos Kopidakis, Carlos Silva, Natalie Stingelin, Garry Rumbles
AbstractThe influence of solid‐state microstructure on the optoelectronic properties of conjugated polymers is widely recognized, but still poorly understood. Here, we show how the microstructure of conjugated polymers controls the yield and decay dynamics of long‐lived photogenerated charge in neat films. Poly(3‐hexylthiophene) was used as a model system. By varyi...... hiện toàn bộ
Phosphoric acid‐doped imidazolium ionomers with enhanced stability for anhydrous proton‐exchange membrane applications
Journal of Polymer Science, Part B: Polymer Physics - Tập 51 Số 17 - Trang 1311-1317 - 2013
Zhihong Si, Fenglou Gu, Jiangna Guo, Feng Yan
ABSTRACTPhosphoric acid‐doped crosslinked proton‐conducting membranes with high anhydrous proton conductivity, and good chemical stability in phosphoric acid were synthesized and characterized. The synthetic procedure of the acid‐doped composite membranes mainly involves the in situ crosslinking of polymerizable monomer oils (styrene and ...... hiện toàn bộ
Membrane formation by isothermal precipitation in polyamide‐formic acid‐water systems I. Description of membrane morphology
Journal of Polymer Science, Part B: Polymer Physics - Tập 33 Số 2 - Trang 211-222 - 1995
Liao‐Ping Cheng, An‐Hwa Dwan, Carl C. Gryte
AbstractAliphatic polyamides (Nylon‐66 and a Nylon‐6, ‐66, ‐610 terpolymer) were isothermally precipitated from formic acid solution by immersing in an aqueous nonsolvent bath or a solvent/nonsolvent mixture. Depending on the composition of the polymer solution and nonsolvent bath, phase separation by nucleation and growth can be initiated for a liquid‐liquid phase...... hiện toàn bộ
An improved model for mass transfer during the formation of polymeric membranes by the immersion‐precipitation process
Journal of Polymer Science, Part B: Polymer Physics - Tập 32 Số 8 - Trang 1413-1425 - 1994
Liao‐Ping Cheng, Young S. Soh, An‐Hwa Dwan, Carl C. Gryte
AbstractAn analysis is presented, which describes the isothermal ternary diffusion process encountered in the formation of a cellulose acetate polymeric membrane by a direct immersion‐precipitation of polymeric solutions in a nonsolvent bath. A material coordinate was employed to derive the mass transfer equations for the membrane solution and the convective mass t...... hiện toàn bộ
Chromism of soluble polythienylenes
Journal of Polymer Science, Part B: Polymer Physics - Tập 25 Số 5 - Trang 1071-1078 - 1987
Soonil D.D.V. Rughooputh, Shu Hotta, A. J. Heeger, Fred Wudl
AbstractThermochromism and solvatochromism of solutions of poly(3‐alkylthienylenes) are reported. The experimental results indicate the presence of two coexisting phases: polymer in solution and polymer in microcrystalline aggregates. From the concentration independence of the thermochromism, it is concluded that the transition is fundamentally driven by a single c...... hiện toàn bộ
Biomedical applications of biodegradable polymers
Journal of Polymer Science, Part B: Polymer Physics - Tập 49 Số 12 - Trang 832-864 - 2011
Bret D. Ulery, Lakshmi S. Nair, Cato T. Laurencin
AbstractUtilization of polymers as biomaterials has greatly impacted the advancement of modern medicine. Specifically, polymeric biomaterials that are biodegradable provide the significant advantage of being able to be broken down and removed after they have served their function. Applications are wide ranging with degradable polymers being used clinically as surgi...... hiện toàn bộ
A scaling analysis of the fracture mechanisms in glassy polymers
Journal of Polymer Science, Part B: Polymer Physics - Tập 25 Số 2 - Trang 353-368 - 1987
Andrew Alderson
AbstractRecent experimental work on craze growth in polymers has shown that the reptation model for polymer motion may be successfully applied, in certain cases, to the behavior of glassy polymers in the solid phase. In this paper, a simple scaling analysis is presented to show how the primitive path model for reptation may be applied to the behavior of glassy poly...... hiện toàn bộ
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