| Abstract: | A dicarboxylic acid ( 1 ) bearing two pre-formed imide rings, was prepared from the condensation of 2,2-bis4-(4-aminophenoxy)phenyl]propane and trimellitic anhydride. A new family of poly(amide-imide)s having inherent viscosities of 0.53–1.68 dL/g was prepared by the triphenyl phosphite activated polycondensation from the diimide—diacid I with various aromatic diamines in a medium consisting of N-methyl-2-pyrolidone (NMP), pyridine, and calcium chloride. Most of the resulting polymers showed an amorphous nature and were readily soluble in polar solvents such as NMP and N,N-dimethylacetamide. All the soluble poly(amide-imide)s afforded transparent, flexible, and tough films. The glass transition temperatures of these poly(amide-imide)s were in the range of 237–293°C and the 10% weight loss temperatures were above 508°C in nitrogen. © 1993 John Wiley & Sons, Inc. |
