Results 121 to 130 of about 845 (172)

Sulfonated poly(ether sulfone ether ketone ketone)/sulfonated poly(ether sulfone) blend membranes with reduced methanol permeability

High Performance Polymers, 2012
Proton exchange membranes were prepared by blending sulfonated poly(ether sulfone ether ketone ketone) (SPESEKK) with sulfonated poly(ether sulfone) (SPES). The morphology, tensile strength, proton conductivity and methanol permeability of the blend membranes were investigated.
Rong Zeng, Shuqin Xiao, Lie Chen, Yiwang Chen   +3 more
openaire   +1 more source

Cation permeable membranes from blends of sulfonated poly(ether ether ketone) and poly(ether sulfone)

Journal of Membrane Science, 2002
Sulfonated poly(aryl ether ether ketone), S-PEEK, is blended with non-sulfonated poly(ether sulfone) (PES) to adjust the properties of ion permeable and ion selective membranes. In this study, membranes are prepared from blends with (i) a S-PEEK content between 10 and 100 wt.% using one S-PEEK batch with a fixed degree of sulfonation and (ii) from ...
Wilhelm, F.G., Punt, Ineke G.M., van der Vegt, N.F.A., Strathmann, H., Wessling, Matthias   +4 more
openaire   +2 more sources

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
openaire   +2 more sources

Synthesis and properties of poly(ether ether ketone ketone)‐poly(ether sulfone) block copolymers

Journal of Applied Polymer Science, 1996
Poly(ether ether ketone ketone)-poly(ether sulfone) (PEEKK/PES) block copolymers were prepared from the corresponding oligomers via a nucleophilic aromatic substitution reaction, and the M n of the PEEKK segment was fixed at 12,000, while the M n 's of the PES segment ranged from 250 to 12,680.
Junkui Cao, Junzuo Wang, Yan Chen, Zhongwen Wu   +3 more
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

Sulfonated poly(ether ether ketone) and sulfonated poly(1,4-phenylene ether ether sulfone) membranes for vanadium redox flow batteries

High Performance Polymers, 2012
Nafion is a currently used as a proton exchange membrane in vanadium redox flow batteries (VRBs). It is an excellent proton-conducting and fully hydrated membrane, but it is costly. In order to reduce the cost of the membrane used in VRBs and to reduce vanadium permeability across the membrane, sulfonated poly(ether ether ketone ...
Suraluck Macksasitorn, Sairung Changkhamchom, Anuvat Sirivat, Kitipat Siemanond   +3 more
openaire   +1 more source

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