Synthesis and Characterization of Some Aromatic Polyamideimides from Diamino- Pyrromellitimides and Dicarboxylic Acid
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Abstract
Four polyamideimides have been synthesized by direct polycondensation of four diimide-diamines and aromatic dicarboxylic acid- terephthalic acid (TPA). The diimide-diamines (3a-d) were synthesized from pyrromellitic dianhydride and the amines” p-phenylene diamine(2a); benzidine(2b); 4,4'-diaminodiphenylmethane (2c) and 4,4'
- diaminodiphenylsulphone(2d) 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).