Novel soluble aromatic poly(ether amide sulfone amide ether ketone ketone)s by electrophilic solution polycondensation

Abstract

A new monomer, N,N ^'-bis(4-phenoxybenzoyl)-4,4^'-diaminodiphenyl sulfone (BPBDAS), was prepared by the condensation of 4,4^'-diaminodiphenyl sulfone with 4-phenoxybenzoyl chloride in N,N-dimethylacetamide. Novel soluble aromatic poly(ether amide sulfone amide ether ketone ketone)s (PEASAEKKs) were synthesized by electrophilic solution copolycondensation of BPBDAS with a mixture of terephthaloyl chloride and isophthaloyl chloride in the presence of anhydrous aluminum chloride and N-methylpyrrolidone in 1,2-dichloroethane. The influences of reaction conditions on the preparation of polymers were examined. All these polymers are amorphous and soluble in aprotic polar solvents due to the incorporation of 4,4^'-dibenzoylaminodiphenyl sulfone moieties in the main chain. Thermal analyses showed that the polymers had high T _g values of 236—259 ^°C and exhibited high thermal stability. All the polymers formed transparent, strong, and flexible films, with tensile strengths of 97.6—103.7 MPa, Young’s moduli of 2.12—2.45 GPa, and elongations at break of 10.6—13.8%.