Synthesis and Characterization of Silicon-Containing Poly(amide-amide)s

摘要

A modified new aromatic diacid, bis[(4-carboxyphenyl) 4-benzamide] dimethylsilane (IV) with preformed amide linkages and a silicon moiety was synthesized and characterized by IR, NMR, mass spectroscopy, and a physical consstant. 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. Thse poly(amide-amide)s showed glass-transition temperatures of 303-378 deg C as measured by DSC and showed no weight loss below 377 deg C in a nitrogen atmosphere.