Poly(amide-imide)s Containing Polybutadiene Blocks

Abstract

Poly(amide-imide)s containing polybutadiene blocks were prepared by reaction of 4,4'-methylenedi(phenyl isocyanate) with trimellitic anhydride and α,ω-diisocyanatopolybutadiene. The polymers were characterized by spectroscopic methods and X-ray diffraction. Incorporation of 5 wt.% of polybutadiene structures into polyimide decreases the temperature of 10% weight loss in nitrogen by 90 °C. Glass transition temperature of the polymer also decreases with the increasing content of soft polybutadiene segments, but the decrease is moderate for the contents higher than 20 wt.%. Broad amorphous halo dominates wide-angle X-ray diffractograms of all the samples, but sharper peaks of a more ordered structure were observed in definite concentration range of polybutadiene blocks. The copolymers are soluble in N-methylpyrrolidone.