Preparation and properties of novel thermally stable pyridine-based poly(amide imide amide)s

Abstract

The 2,6-bis(4-nitrobenzamido)pyridine was prepared via reaction of 2,6-diaminopyridine with two moles of 4-nitrobenzoyl chloride in the presence of propylene oxide. Catalytic reduction of nitro groups of 2,6-bis(4-nitrobenzamido)pyridine with hydrazine yielded 2,6-bis(4-aminobenzamido)pyridine. Reaction of this diamine with two moles of trimellitic anhydride afforded a diacid with preformed amide and imide structures. Poly(amide imide amide)s were prepared by direct polycondensation reactions of the diacid with different diamines in the presence of triphenyl phosphite. All the precursors and polymers were fully characterized using common spectroscopic methods and elemental analysis and physical properties of the polymers including solution viscosity, thermal stability, thermal behavior, and solubility were studied. According to the obtained results the polymers showed high thermal stability and enhanced solubility. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011