Synthesis and Characterization of Optically Active Aromatic Polyimides Derived from 2,2'-Bis(2-trifluoro-4-aminophenoxy)-1,1'-Binaphthyl and Aromatic Tetracarboxylic Dianhydrides

摘要

Optically active 2,2'-bis(2-trifluoro-4-aminophenoxy)-1,1'-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1'-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,N'-dimethylacetamide, and m-cresol and had glass-transition temperatures of 256 approx 278 deg C. The specific rotations of the chiral polymers ranged from 167 approx 258 deg, and their chiroptical properties also were studied.