Synthesis and properties of poly(amide‐imide)s derived from trimellitic anhydride, ω‐amino acids, and aromatic diamines

Abstract

AbstractSeven imidodicarboxylic acids II‐1 to 5, II‐10, and II‐11 were prepared from trimellitic anhydride and ω‐amino acids, such as glycine, β‐alanine, 4‐aminobutyric acid, 5‐aminopentanoic acid, 6‐aminohexanoic acid, 11‐aminoundecanoic acid, and 12‐aminododecanoic acid. Several aliphatic‐aromatic poly(amide‐imide)s were prepared by triphenyl phosphite promoted polycondensation reaction from the combination of 3‐(4‐carboxyphthalimido)propionic acid (II‐2) or 6‐(4‐carboxyphtalimido)hexanoic acid (II‐5) with various aromatic diamines and of all the imidodiacids with p‐phenylenediamine or 4,4′‐oxydianiline. All poly(amide‐imide)s were characterized by inherent viscosity, gel permeation chromatography (GPC) measurements, solubility, tensile test, wide‐angle X‐ray scatting patterns, differential scanning calorimetry (DSC) measurements, and thermogravimetric (TGA) analyses. Effects of structural changes such as polymethylene length and diamine moieties on the properties of poly(amide‐imide)s were studied. © 1994 John Wiley & Sons, Inc.