Synthesis and characterization of polyamideimides from diaminobenzophenone-3,3′ ,4,4′ -tetracarboxylic diimides and aromatic dicarboxylic acid— terephthalic acid (TPA)

Four polyamideimides have been synthesized by direct polycondensation of imide containing diamines with
dicarboxylic acid- terephthalic (TPA). The diimide-diamines were synthesized from benzophenone-3,3′
,4,4′
-
tetracarboxylic dianhydride with aromatic diamines — p-phenylene diamine(5a); benzidine(5b); 4,4′
-
diaminodiphenylmethane (5c) and 4,4’- diaminodiphenylsulphone(5d) respectively .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).