Synthesis and characterization of organosoluble polyimides with trifluoromethyl-substituted benzene in the side chain

被引:59
作者
Liu, JG [1 ]
He, MH [1 ]
Li, ZX [1 ]
Qian, ZG [1 ]
Wang, FS [1 ]
Yang, SY [1 ]
机构
[1] Chinese Acad Sci, Ctr Mol Sci, State Key Lab Engn Plast, Beijing 100080, Peoples R China
关键词
fluorinated diamines; fluorinated polyimides; films; solubility; transparency; thermal stability;
D O I
10.1002/pola.10240
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
New aromatic diamines substituted with a trifluoromethyl group in the side chain, 2,4-diamino-3'-trifluoromethylazobenzene, 2,4-diamino-1-[(4'-trifluoromethylphenoxy) phenyl] aniline, and 3,5-diamino-1-[(4'-trifluoromethyl phenoxy) phenyl] benzamide were synthesized and characterized and used to prepare polyimides by a one-step high-temperature polycondensation method. Experimental results indicated that the prepared polyimides possess good solubility in strong organic solvents such as N-methyl-2-pyrrolidinone, NN'-dimethylformamide, and NN'-dimethylacetamide. Homogeneous solutions with solid contents as high as 15-20% can be prepared, which are stable for storing longer than 2 weeks at room temperature. The polyimides exhibited glass-transition temperatures of 249-292 degreesC and good thermal stability. The PI-I-c and PI-IIIc films prepared by casting the fully imidized polymer solutions showed good transparency with cutoff wavelengths at 320-330 nm. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:1572 / 1582
页数:11
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