Results 121 to 130 of about 851 (169)

Biofilm behavior on sulfonated poly(ether-ether-ketone) (sPEEK)

Materials Science and Engineering: C, 2017
Poly(ether-ether-ketone) (PEEK) has also shown to be very attractive for incorporating therapeutic compounds thanks to a sulfonation process which modifies the material structure resulting in a sulfonated-PEEK (sPEEK). Concerning biomedical applications, the objective of this work was to evaluate the influence of different sulfonation degree of sPEEK ...
Juan F D, Montero, Henrique A, Tajiri, Guilherme M O, Barra, Márcio C, Fredel, Cesar A M, Benfatti, Ricardo S, Magini, Andréa L, Pimenta, Júlio C M, Souza   +7 more
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Preparation and characterization of poly(ether sulfone)/sulfonated poly(ether ether ketone) blend membranes

European Polymer Journal, 2006
Abstract Polymer blends of sulfonated poly(ether ether ketone) (SPEEK) and poly(ether sulfone) (PES) in N-methyl-2-pyrrolidinone (NMP) were prepared by solution casting. The investigation on water uptake, methanol uptake, permeability and proton conductivity has been conducted. The spin-lattice relaxation time in the rotating frame ( T 1 ρ
Han-Lang Wu, Chen-Chi M. Ma, Fang-Yi Liu, Chih-Yuan Chen, Shu-Jung Lee, Chin-Lung Chiang   +5 more
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Synthesis and characterization of poly(ether sulfone) and poly(ether sulfone ketone) copolymers

Journal of Applied Polymer Science, 1999
Poly(ether sulfone) and poly(ether sulfone ketone) copolymers (I-V) were synthesized by the nucleophilic substitution reaction of 4,4'-dihydroxy diphenyl sulfone (DHDPS, A) with various mole proportions 4,4'-difluoro benzophenone (DFBP, B) and 4,4'-difluoro diphenyl sulfone (DFDPS, C) using sulfolane as solvent in the presence of anhydrous K 2 CO 3 ...
V. Lakshmana Rao, P. U. Sabeena, M. Rama Rao, K. N. Ninan   +3 more
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Compatibility in immiscible poly(ether ether ketone)/poly(ether sulfone) blends

Journal of Applied Polymer Science, 1995
AbstractBoth as‐molded and annealed poly(ether ether ketone) (PEEK)/poly(ether sulfone) (PES) blends have been prepared by direct injection molding. The system has been found to be immiscible at all compositions; however, as a result mainly of the produced morphology, it surprisingly maintains to a very great extent the excellent mechanical performance
A. Arzak, J. I. Eguiazábal, J. Nazábal
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Synthesis and properties of novel random copolymers of poly(ether ketone ether ketone ketone)–poly(ether ketone sulfone imide)

High Performance Polymers, 2013
The monomer containing sulfone and imide linkages, namely bis[4-( p-phenoxybenzoyl)-1,2-benzenedioyl]- N, N, N′, N′-4,4′-diaminodiphenyl sulfone (BPBDADPS), was prepared by the Friedel–Crafts reaction of bis(4-chloroformyl-1,2-benzenedioyl)- N, N, N′, N′-4,4′-diaminodiphenyl sulfone with diphenyl ether.
Minghong Zhou, Yongfeng Sun, Yikai Yu, Mingzhong Cai   +3 more
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Synthesis and properties of poly(ether ether ketone)-poly(ether sulfone) block copolymers

Polymer, 1994
Two series of block copolymers composed of poly(ether ether ketone) (PEEK) and poly(ether sulfone) (PES) components were prepared from the corresponding oligomers via a nucleophilic aromatic substitution reaction. In the first series of block copolymers, the Mn of the PEEK segment was fixed at 10 000, while the Mns of the PES segments ranged from 250 ...
Junkui Cao, Wencheng Su, Zhongwen Wu, Tatsuki Kitayama, Koichi Hatada   +4 more
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Synthesis of copolymers of poly(ether sulfone ether ketone ketone) and poly(ether ketone diphenyl ketone ether ketone ketone) by electrophilic Friedel–Crafts solution polycondensation

Polymers for Advanced Technologies, 2011
AbstractA new monomer, 4,4′‐bis(4‐phenoxybenzoyl)diphenyl(BPOBDP), was synthesized via a two‐step synthetic procedure. A series of novel poly(ether sulfone ether ketone ketone)/poly(ether ketone diphenyl ketone ether ketone ketone) copolymers were prepared by electrophilic Friedel–Crafts solution copolycondensation of isophthaloyl chloride (IPC) with a
Mingzhong Cai, Meihua Zhu, Fen Xiao, Nengwen Ding, Caisheng Song   +4 more
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Crystallization behaviour of poly(ether ether ketone)/poly(ether sulfone) block copolymer

Polymer, 1996
The crystallization and melting behaviours of a multiblock copolymer comprising poly(ether ether ketone) (PEEK) and poly(ether sulfone) (PES) blocks whose number average molecular weights were 10 000 and 2900, respectively, were studied. The effect of thermal history on crystallization was investigated by wide-angle X-ray diffraction measurement.
Junkui Cao, Wencheng Su, Zhongwen Wu, Jingjiang Liu, Tatsuki Kitayama, Koichi Hatada   +5 more
openaire   +1 more source

Proton-exchange Sulfonated Poly(ether ether ketone)/Sulfonated Phenolphthalein Poly(ether sulfone) Blend Membranes in DMFCs

Chinese Journal of Chemical Engineering, 2009
Abstract A sulfonated poly(ether ether ketone) (SPEEK) membrane with fairly high degree of sulfonation (DS) swells excessively and even dissolves at high temperature. To solve these problems, sulfonated phenolphthalein poly(ether sulfone) (SPES-C, DS53.7%) is blended with the SPEEK matrix (DS55.1%, 61.7%) to prepare SPEEK/SPES-C blend membrane.
Qijun GAO, Yuxin WANG, Li XU, Zhitao WANG, Guoqiang WEI   +4 more
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Development of Sulfonated Poly(ether-ether ketone)s for PEMFC and DMFC

2008
During the last two decades, extensive efforts have been made to develop alternative hydrocarbon-based polymer electrolyte membranes to overcome the drawbacks of the current widely used perfluorosulfonic acid Nafion. This chapter presents an overview of the synthesis, chemical properties, and polymer electrolyte fuel cell applications of new proton ...
Kim, Dae Sik, Guiver, Michael
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