HETEROCYCLIC POLYAMIDES CONTAINING HEXAFLUOROISOPROPYLIDENE GROUPS

New heterocyclic polyamides have been synthesized by solution polycond ensation of aromatic diamines containing phenylquinoxaline units with diacid chlorides having both imide and hexanuoroisopropylidene (6F) gr oups. These polymers are soluble in polar aprotic solvents, such as N- methylpyrrolidone (NMP) or N,N-dimethylformamide (DMF), and can be cas t into flexible thin films from solutions. They show high thermooxidat ive stability with decomposition temperatures above 400 degrees C and glass transition temperatures in the range of 225 - 300 degrees C. The polymer films exhibit good chemical resistance towards diluted acids and good electrical insulating properties with dielectric constants in the range of 3.2 - 3.7.