Autodiffusion and phase separation in aqueous solutions of polyoxypropylene diol

Abstract

Phase equilibrium in the polyoxypropylene-water system at the lower consolute temperature has been studied by an NMR impulse method and by an interference micro-method. An analysis of the shape of the diffusional attenuations which in this case are complex, and also of the experimentally obtained population values, enabled one to construct the phase diagram in the 250-315° K range. The concentrated polymer phase formed by phase separation consists of polyoxypropylene diol, almost free of water. © 1989.