SYNTHESIS AND PROPERTIES OF POLY(AMIDE-IMIDE)S DERIVED FROM TRIMELLITIC ANHYDRIDE, OMEGA-AMINO ACIDS, AND AROMATIC DIAMINES

Seven imidodicarboxylic acids II-1 to 5, II-10, and II-11 were prepare d from trimellitic anhydride and omega-amino acids, such as glycine, b eta-alanine, 4-aminobutyric acid, 5-aminopentanoic acid, 6-aminohexano ic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. Several aliphatic-aromatic poly (amide-imide) s were prepared by triphenyl ph osphite promoted polycondensation reaction from the combination of 3- (4-carboxyphthalimido)propionic acid (II-2) or 6-(4-carboxyphthalimido ) hexanoic acid (II-5) with various aromatic diamines and of all the i midodiacids with p -phenylenediamine or 4,4'-oxydianiline. All poly (a mide-imide) s were characterized by inherent viscosity, gel permeation chromatography (GPC) measurements, solubility, tensile test, wide-ang le X-ray scatting patterns, differential scanning calorimetry (DSC) me asurements, and thermogravimetric (TGA) analyses. Effects of structura l changes such as polymethylene length and diamine moieties on the pro perties of poly(amide-imide)s were studied. (C) 1994 John Wiley & Sons , Inc.