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Synthesis and characterization of optically active aromatic polyimides derived from 2,2′-bis(2-trifluoro- 4-aminophenoxy)-1,1′-binaphthyl and aromatic tetracarboxylic dianhydrides

✍ Scribed by Qiding Mi; Yu Ma; Lianxun Gao; Mengxian Ding

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
140 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

Optically active 2,2Ј-bis(2-trifluoro-4-aminophenoxy)-1,1Ј-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1Ј-bi-2-naphthol with 2-chloro-5-nitrotrifluorotoluene and subsequently by the reduction of the resulting dinitro compounds. A series of optically active and optically inactive aromatic polyimides also were prepared therefrom. These polymers readily were soluble in common organic solvents such as pyridine, N,NЈ-dimethylacetamide, and m-cresol and had glass-transition temperatures of 256 ϳ 278 °C. The specific rotations of the chiral polymers ranged from 167 ϳ 258°, and their chiroptical properties also were studied.

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