PHASE-EQUILIBRIUM AND MUTUAL DIFFUSION IN THE POLY(SULFONE)-DIMETHYLSULFOXIDE SYSTEM

Phase equilibrium and mutual diffusion in the poly(sulfone) (PSF)-dime thylsulfoxide (DMSO) system have been studied at temperatures from 20 to 110-degrees-C over a wide solution composition range. The phase dia gram for this system has been obtained and the effect of water on boun dary concentrations has been studied. It is shown that the presence of water in DMSO has a considerable effect on the binodal curve. Thus, i ncreasing the water content up to 1.3% by weight results in the displa cement of the upper critical solution temperature by 30-degrees-C and the widening of the two-phase region. The kinetic regularities in mutu al dissolution of components have been investigated. The concentration dependencies of the mutual diffusion coefficients in the systems stud ied are presented. The effect of moisture in DMSO on the mutual diffus ion coefficients appears near the phase transition in the system. (C) 1994 John Wiley & Sons, Inc.