Enhanced thermo-oxidative stability of sulfophenylated poly(ether sulfone)s

POLYMER

卷:51

Article

Liu, Baijun¹  Robertson, Gilles P.²  Kim, Dae-Sik²  Sun, Xiaohong³  Jiang, Zhenhua¹  Guiver, Michael D.² 

[1] Jilin Univ, Alan G Macdiarmid Inst, Changchun 130012, Peoples R China

[2] Natl Res Council Canada, Inst Chem Proc & Environm Technol, Ottawa, ON K1A 0R6, Canada

[3] Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Peoples R China

关键词: Poly(ether sulfone)s;    Proton exchange membranes;    Sulfonation;   

DOI  :  10.1016/j.polymer.2009.12.014

来源: Elsevier

【 摘 要 】

Monophenylated poly(ether sulfone)s (Ph-PES) and diphenylated poly(ether sulfone)s (DiPh-PES), were synthesized as starting materials for the preparation of sulfonated polymers with well-defined chemical structure. Mild post-polymerization sulfonation conditions led to sulfonated Ph-PES(Ph-PES) bearing acid groups on both the pendant phenyl group and the backbone, and sulfonated DiPh-PES (DiPh-SPES) bearing acid groups only on the two pendant phenyl groups. Both series of polymers had excellent mechanical properties, high glass transition temperatures, good thermal and oxidative stability, as well as good dimensional stability. It is interesting to note that exclusively pendant-phenyl-sulfonated (bis-sulfophenylated) DiPh-SPES copolymers possessed obviously better thermal and oxidative stability compared with the corresponding pendant-phenyl-sulfonated/main-chain-sulfonated Ph-SPES copolymers. The methanol permeability values of the membranes were in the range of 7.0 x 10(-7)-9.4 x 10(-8) cm(2)/s at 30 degrees C, which is several times lower than that of Nafion 117. DiPh-SPES-50 and Ph-SPES-40 also exhibited high proton conductivity (approximately 0.13 S/cm at 100 degrees C). (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

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