INVESTIGATIONS ON POLYURETHANE ANIONOMERS USING 3,4-DIHYDROXYCINNAMICACID .1.

Polyurethanes of different compositions were synthesized by chain exte nding the prepolymer formed by the reaction of poly(tetramethylene oxi de)glycol and tolylene diisocyanate with 3,4-dihydroxycinnamic acid. T he polyurethanes were characterized using Fourier transform infra-red and Fourier transform nuclear magnetic resonance spectroscopies. The m olecular weights of the polymers were determined using gel permeation chromatography. The polyurethane anionomers showed typical polyelectro lyte behaviour. The glass transition temperatures of the polyurethanes and their anionomers were determined by differential scanning calorim etry. The thermal stabilities of the polymers were evaluated using a t hermogravimetric analyser. (C) 1996 Elsevier Science Ltd.