Synthesis and characterization of new copoly(amide-imide)s based on N,N’-(4,4’-diphenylsulfone)bistrimellitimide with different diacids and diamines
In this paper six new copoly(amide-imide)s (7a-f) were synthesized through the direct polycondensation reaction of N,N'-(4,4'-diphenylsulfone)bistrimellitimide (1) with 4,4'-diamino diphenylsulfone (2), 4,4'-diamino diphenylether (3), in the presence of adipic acid (4), fumaric acid (5) or terephthalic acid (6) as the second diacid in a medium consisting of N-methyl-2-pyrrolidone, triphenyl phosphite, calcium chloride and pyridine. The resulted polymers were fully characterized by means of FTIR spectroscopy, elemental analyses, inherent viscosity, solubility tests and UV-vis spectroscopy. Thermal stabilities of resulted polymers (7a-c) containing three different second diacids were compared by using TGA and DTG thermograms.
KEY WORDS: Highperformance polymers, Copoly(amide-imide)s, Direct polycondensation, Thermal properties
Bull. Chem. Soc. Ethiop. 2010, 24(2), 289-294.