Synthesis and Properties of New Polyamides Based on Bis[4-(4-aminophenoxy)phenyl]diphenylmethane

Abstract

A new diamine, bis[4-(4-aminophenoxy)phenyl]diphenylmethane (BAPDM ), bearing diphenylmethylene linkage was prepared starting from bis(4-hydroxyphenyl)diphenylmethane. The diamine was reacted with various aromatic dicarboxylic acids to obtain a series of new polyamides with moderate to high inherent viscosities of 0.65−0.97 dL g -1 . Almost all of the polymers could be readily dissolved in NMP, N,N -dimethylacetamide, N,N -dimethylformamide, dimethyl sulfoxide, m -cresol, pyridine, tetrahydrofuran, and cyclohexanone. All of the polymers were amorphous, and the polyamide films had a tensile strength range of 85−108 MPa. These polyamides had glass transition temperatures between 237 and 272 °C and 10% weight loss temperatures in the range 500−524 °C in nitrogen.