POLY(BENZOXAZINONE-IMIDE)S AND POLY(BENZOXAZINONE-PHENYLQUINOXALINE-IMIDE-AMIDE)S CONTAINING HEXAFLUOROISOPROPYLIDENE UNITS

Fluorine-containing poly(benzoxazinone-imide)s and poly(benzoxazinone- phenylquinoxaline-imide-amide)s have been synthesized by solution poly condensation of diacid dichlorides containing imide and hexafluoroisop ropylidene groups with 4,4'-diaminodiphenylmethane-3,3'-dicarboxylic a cid or with mixtures of the latter with a diamino phenylquinoxaline. T hese polymers show high thermal stability, the decomposition temperatu res being in the range of 450-470-degrees-C. Transparent flexible film s were cast from the solutions of the corresponding polyamidic acid in termediates that after thermal cyclization showed low dielectric const ant which recommends them for future applications in microelectronics.