Ion-Dipole Interactions in Polyether Polyurethane-Styrene Ionomers Blends

摘要

Several recent publications have been devoted to the area of miscibility enhancement in blends of polyurethanes and polystyrene utilizing ion-ion interactions. In those studies, the polystyrene contained small concentrations of pendant sulfonic acid groups, while the polyurethane had, as a part of the hard segment, tertiary amine groups. It was shown in these studies that miscibility was, indeed, achieved between the polystyrene and the hard segment of the polyurethane. The miscibility enhancement mechanisms consisted of ionic interaction which resulted from proton transfer from the sulfonic acid to the tertiary amine. In a subsequent study, it was also shown that the sulfonic acid is a strong enough proton donor to transfer the hydrogen even to the nitrogen on the urethane or urea groups. These mechanistic interpretations are now the subject of IR and NMR studies. Reprints. (JES)