Synthesis and Characterization of Thermally Stable Sulfonated Polybenzimidazoles

Abstract

Abstract: A series of sulfonated polybenzimidazoles(sPBI-IE) with various sulfonation levels was synthesized from 5-sulfoisophthalic acid monosodium salt,4,4'-dicarboxydiphenyl ether and 3,3'-diaminobenzidine by solution copolycondensation in poly(phosphoric acid).The resulting polymers with good solubilities in DMF,DMSO and DMAc were characterized by FTIR,¹H NMR,GPC and TGA.The number average molecular weights of the sodium salt form sPBI-IE are 41 300—46 900,and the polydispersity indices are in the range of 2.15—2.54.The synthesized sPBI-IE presents excellent thermal stabilities,the onset decomposition temperature and the 5% and 10% weight loss temperatures are higher than 513, 573 and 597 ℃,respectively.

Key words: Polybenzimidazole, Sulfonation, Poly(phosphoric acid), Proton exchange membrane

CLC Number:

O631

TrendMD:

QING Sheng-Bo, HUANG Wei, YAN De-Yue. Synthesis and Characterization of Thermally Stable Sulfonated Polybenzimidazoles[J]. Chem. J. Chinese Universities, 2005, 26(11): 2145.

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Synthesis and Characterization of Thermally Stable Sulfonated Polybenzimidazoles

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