Synthesis and Characterization of Polyamide imides from N-(P-Carboxypheny)l Trimellitimide with Aromatic Diamines

Four polyamide imides have been synthesized by direct polycondensation of imide containing dicarboxylic acid with aromatic diamines. — p-phenylene diamine(2a);benzidine(2b);4,4’-diaminodiphenylmethane (2c) and 4,4’- diaminodiphenylsulphone(2d) respectively The imide-diacid (IIIa) was synthesized from Trimellitic acid anhydride(TMA) and paminobenzoic acid (PABA).The polycondensation reaction were done using triphenylphosphite(TPP)/pyridine(Py) in N-methyl-2-pyrrolidone(NMP) in the presence of calcium chloride and lithium chloride via. Phosphorylation method. The polyamideimides have been characterized by IR and 1H NMR spectroscopy and elemental analysis. The solubility and intrinsic viscosity of the polymers have been determined. Thermal stability of the polymers was checked by thermogravimetric analysis (TGA) and differential thermogravimetric analysis (DTG).