NEW POLY(AMIDE-IMIDE) SYNTHESES .5. PREPARATION AND PROPERTIES OF POLY(AMIDE-IMIDE)S BASED ON THE DIIMIDE DIACID CONDENSED FROM 2,2-BIS[4-(4-AMINOPHENOXY)PHENYL]PROPANE AND TRIMELLITIC ANHYDRIDE

A dicarboxylic acid (I) bearing two pre-formed imide rings, was prepared from the condensation of 2,2-bis[4-(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-degrees-C and the 10% weight loss temperatures were above 508-degrees-C in nitrogen. (C) 1993 John Wiley & Sons, Inc.