Synthesis and characterization of phenylated aromatic poly(amide–amide)s

Abstract

A modified new aromatic diamine 2,5-bis[(4-aminophenyl)4-benzamide]-3,4-diphenyl thiophene (VI) with preformed amide linkages and pendant phenyl substituents was synthesized, characterized by IR, NMR, mass spectroscopy, and a physical constant. Novel poly(amide–amide)s were synthesized from VI and aromatic diacid chlorides in N,N-dimethylacetamide by a solution polycondensation technique. The polymers were obtained in 98–100% yields and showed reduced viscosities in the range of 0.80–2.68 dL/g. They were readily soluble in aprotic polar solvents. These poly(amide–amide)s showed glass transition temperatures of 277–280°C as measured by DSC and showed no weight loss below 412°C in a nitrogen atmosphere. The polymers showed moisture regain in the range of 9.52–12.67%. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1523–1530, 1998