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Synthesis and properties of polyimides from thianthrene-2,3,7,8-tetracarboxylic dianhydride-5,5,10,10-tetraoxide

✍ Scribed by Jianqiang Hao; Kazuhiro Tanaka; Hidetoshi Kita; Ken-Ichi Okamoto

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 247 KB
Volume: 36
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(199802)36:3<485::aid-pola12>3.0.co;2-j

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✦ Synopsis

Thianthrene -2,3,7,8 -tetracarboxylic dianhydride -5,5,10,10 -tetraoxide (TADATO)

, a dianhydride having two sulfonyls between two phenyl rings, was synthesized and polymerized with several diamines by a two-step method. Tough polyimide membranes were obtained with flexible diamines but not with rigid diamines. Most of TADATO-based polyimides are soluble in polar solvents such as N,N-dimethylacetamide and N-methyl-2-pyrrolidone. IR study confirmed that almost complete imidization of TADATO-based poly(amic acid) membranes could be achieved by thermal treatment at 100, 200, and 300ЊC for each 1 h. In a series of polyimides based on 4,4 -oxydianiline, the polyimide from TADATO showed higher gas permeability coefficient of CO 2 and higher selectivities of CO 2 /N 2 and CO 2 /CH 4 than those of polyimides from pyromellitic dianhydride and 3,3,4,4-biphenyltetracarboxylic dianhydride, and was comparable to that from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride. ᭧ 1998

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