POLY(ESTER-N-SUBSTITUTED URETHANE)S WITH CARBOXYLATE GROUPS. SYNTHESIS, CHARACTERIZATION AND SOLUTION PROPERTIES

摘要

A convenient altemative to incorporate carboxylate units on urethane nitrogen atoms through polymer modification of a neutral polyesterurethane with a cyclic monomer, i.e. maleic anhydride, is proposed. The method yields new polyurethane anionomers. Under optimum reaction conditions, polyanions with a degree of substitution corresponding to an ionic content of 30 and 80 meq ionic groups/100 g polymer, respectively, were obtained. These carboxylate anionomers were structurally characterized with respect to a low molecular model and the parent precursor. The results of a viscometric study of anionomers in extremely dilute solutions indicated a polyelectrolyte behavior from 25° to 60℃, while at higher concentration the aggregation of ion pairs was noted.