FLUORENE-CONTAINING POLYESTERS AND POLY(ESTER-AMIDE)S

A series of aromatic polyesters and aromatic poly(ester-amide)s have b een synthesized by polycondensation of diacid chlorides containing pre formed ester groups with 9,9-bis(p-hydroxyphenyl)fluorene or 9,9-bis(p -aminophenyl)fluorene, respectively. These polymers are easily soluble in polar aprotic solvents, and the polyesters are even soluble in chl oroform; their solutions were cast into transparent, thin, flexible fi lms. The polyesters are stable up to 324-335 degrees C, while poly(est eramide)s are stable up to 401-409 degrees C. The dielectric constant of these polymers is in the 3.2 to 4.15 range, being lower for polyest ers. All these characteristics are discussed and compared with those o f related polymers without fluorene units.