Results 241 to 250 of about 14,179 (307)

Thermal degradation of sulfonated poly(aryl ether ether ketone)

Journal of Analytical and Applied Pyrolysis, 1995
The thermal degradation of sulfonated poly(aryl ether ether ketone) (SPEEK), with various degrees of sulfonation, was investigated by high resolution pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry (TG). It was found that the pyrogram of SPEEK is similar to that of poly(aryl ether ether ketone) (PEEK), but that the ...
Yuanfang Luo, Ruizhen Huo, Xigao Jin, Frank E. Karasz   +3 more
openaire   +1 more source

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
openaire   +1 more source

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 carbon nanotubes/sulfonated poly(ether sulfone ether ketone ketone) composites for polymer electrolyte membranes

Polymers for Advanced Technologies, 2011
AbstractA series of composite membranes consisting of sulfonated carbon nanotubes (sCNTs) and sulfonated poly(ether sulfone ether ketone ketone) were successfully fabricated via the solution casting method. The chemical structure, as well as the long‐term stability of the sCNTs in different solvents, was investigated by Fourier transform infrared (FTIR)
Weihua Zhou, Jichun Xiao, Yiwang Chen, Rong Zeng, Shuqin Xiao, Huarong Nie, Fan Li, Caisheng Song   +7 more
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   +1 more source

SULFONATED POLY(ETHER-KETONE)S CONTAINING HEXAFLUOROISOPROPYLIDENE GROUPS

Journal of Macromolecular Science, Part A, 2001
An aromatic poly(ether-ketone) derived from 4,4′−(hexafluoroisopropylidene)-diphenol and 4,4′-difluorobenzophenone has been sulfonated by using chlorosulfonic acid in 1,2-dichloroethane, in the presence of trimethylchlorosilane. The resulting modified polymers had different degrees of sulfonation depending on the reaction conditions.
Hamciuc, C., Bruma, M., Klapper, M.
openaire   +2 more sources

Hybrid Membrane of Sulfonated Poly(aryl ether ketone sulfone) Modified by Molybdenum Clusters with Enhanced Proton Conductivity.

Small
Developing novel proton exchange membranes (PEMs) with low cost and superior performance to replace Nafion is of great significance. Polyoxometalate-doped sulfonated poly(aryl ether ketone sulfone) (SPAEKS) allows for the amalgamation of the advantages ...
Fang Ji, Feng-Yu Jiang, Hongwei Luo, Wenwen He, Xu Han, Wangwang Shen, Menglong Liu, Tao Zhou, Jingmei Xu, Zhe Wang, Yaqian Lan   +10 more
semanticscholar   +1 more source

Preparation and characterization of monovalent cation selective sulfonated poly(ether ether ketone) and poly(ether sulfone) composite membranes

Journal of Colloid and Interface Science, 2006
Highly charged cation permeable composite membranes were prepared by blending of sulfonated poly(ether sulfone) (SPES) with sulfonated poly(ether ether ketone) (SPEEK) in 0 to 90% weight ratio, to adjust the hydrophobic properties and ion selective nature. Extent of sulfonation was confirmed by 1H NMR and ion exchange capacity and degree of sulfonation
G S, Gohil, R K, Nagarale, V V, Binsu, Vinod K, Shahi   +3 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
openaire   +1 more source

Advanced Sulfonated Poly(Ether Ether Ketone)/Graphene-Oxide/Titanium Dioxide Nanoparticle Composited Membrane with Superior Cyclability for Vanadium Redox Flow Battery.

Journal of Nanoscience and Nanotechnology, 2020
The purpose of this study was to improve the repulsion ability of sulfonated poly(ether ether ketone) (SPEEK) membrane for the vanadium ions crossover. For this purpose graphene oxide (GO) nanosheet and titanium dioxide (TiO₂) nanoparticles were employed
Jiaye Ye, Chun Wu, W. Qin, Fangfang Zhong, Mei Ding   +4 more
semanticscholar   +1 more source