INVESTIGATIONS ON POLYURETHANE IONOMERS .2. 3,4-DIHYDROXYCINNAMIC ACID-BASED ANIONOMERS

Polyurethanes of different compositions were synthesized by chain exte nding the prepolymer formed by the reaction of various polyols and dii socyanate with 3,4-dihydroxycinnamic acid. The polyurethanes were conv erted to their anionomers by treating with metal acetates. The polyure thanes were characterized using FTIR, FTNMR, TGA, and DSC analysis. Th e molecular weights of the polymers were determined using GPC. A detai led study of the effect of variation of molecular weight of the polyol s and mol ratio of the various reactants on the glass transition tempe rature and molecular weight of the polyurethanes was made. (C) 1997 Jo hn Wiley & Sons, Inc.