Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution

Sung Koo Lee, Stephen Z D Cheng, Zongquan Wu, Chul Joo Lee, Frank W. Harris, Thein Kyu, Jen Chang Yang

研究成果: 雜誌貢獻文章同行評審

15 引文 斯高帕斯(Scopus)

摘要

Gel/sol and order/disorder transitions can be observed in a segmented rigid-rod polyimide solution at different concentrations and molecular weights. This polyimide was synthesized from 3.3',4,4'-biphenyltetracarboxylic dianhydride and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl in refluxing 3-cresol in a one-step process. Above about 140°C, the polymers are completely soluble in 3-cresol in a concentration range up to 12(w/w)%. During cooling, the hot solutions undergo a mechanical sol/gel transition to form thermally reversible gels. In the gel state, an ordered structure develops. Both the gel/sol and order/disorder transitions are dependent upon concentration, temperature, and molecular weight, but the two transitions exhibit different kinetics. Possible mechanisms of these transitions are discussed.
原文英語
頁(從 - 到)115-122
頁數8
期刊Polymer International
30
發行號1
出版狀態已發佈 - 1993
對外發佈Yes

ASJC Scopus subject areas

  • Polymers and Plastics

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