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

摘要

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 degrees C as measured by DSC and showed no weight loss below 412 degrees C in a nitrogen atmosphere. The polymers showed moisture regain in the range of 9.52-12.67%. (C) 1998 John Wiley & Sons, Inc. [References: 10]