Synthesis and characterization of silicon-containing poly(amide-amide)s

A modified new aromatic diacid, bis[(4-carboxyphenyl) 4-benzamide] dimethylsilane (TV) with preformed amide linkages and a silicon moiety was synthesized and characterized by IR, NMR, mass spectroscopy, and a physical constant. Novel poly(amide-amide)s were synthesized from IV and aromatic diamines by Yamazaki's direct polyamidation method in N-methyl pyrrolidinone. The polymers were obtained in excellent yields and showed reduced viscosities in the range of 0.42-6.15 dL/g. They were readily soluble in aprotic polar solvents. These poly(amide-amide)s showed glass-transition temperatures of 303-378 degreesC as measured by DSC and showed no weight loss below 377 degreesC in a nitrogen atmosphere. (C) 2000 John Wiley & Sons, Inc.