Qing Sheng
2005
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Journal
Chemical Research in Chinese Universities
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.