Poly(phenylquinoxaline‐imide‐amide)s containing perfluoroisopropylidene units

Poly(phenylquinoxaline‐imide‐amide)s have been synthesized by solution polycondensation of aromatic diamines containing preformed phenylquinoxaline units with diacid dichlorides incorporating preformed imide rings and perfluoroisopropylidene units. These polymers show high thermal stability; they decompose above 400°C and have glass transition temperatures in the 225–290°C range. Comparison of these compounds with related heterocyclic polymers leads to the conclusion that the decomposition of the former ones begins with the destruction of amide groups. Films prepared from polymer solutions showed good electrical insulating properties, comparable to those of a standard film (Film H). The highest quality of these poly(phenylquinoxaline‐imide‐amide)s is their remarkable solubility in polar aprotic solvents, which is very important for practical applications.