POLY(PHENYLQUINOXALINE-IMIDE-AMIDE)S CONTAINING PERFLUOROISOPROPYLIDENE UNITS

Poly(phenylquinoxaline-imide-amide)s have been synthesized by solution polycondensation of aromatic diamines containing preformed phenylquin oxaline units with diacid dichlorides incorporating preformed imide ri ngs and perfluoroisopropylidene units. These polymers show high therma l stability; they decompose above 400 degrees C and have glass transit ion temperatures in the 225-290 degrees C range. Comparison of these c ompounds with related heterocyclic polymers leads to the conclusion th at the decomposition of the former ones begins with the destruction of amide groups. Films prepared from polymer solutions showed good elect rical insulating properties, comparable to those of a standard film (F ilm H). The highest quality of these poly(phenylquinoxaline-imide-amid e)s is their remarkable solubility in polar aprotic solvents, which is very important for practical applications.