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 |
卷 | 30 |
發行號 | 1 |
DOIs | |
出版狀態 | 已發佈 - 1993 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 材料化學
- 聚合物和塑料
- 有機化學