THE STATE OF WATER IN SULFOCATIONIC MEMBR ANES WITH DIFFERENT STRUCTURE

The state of water in the membranes based on PA containing sulfoacidic groups (poly-n-(2,2'-dis-ulfonate sodium salt) diphenylene isophthala mide), its blends with Phenylone (poly-n-phenyl isophthalamide) or PE grafted with sulfonated PS was studied by means of DSC and IR spectros copy. The model describing the states of water in the membranes was ad vanced. Equilibrium concentrations of the bound, weakly bound, and fre e water were shown to be controlled not only by water content and chem ical structure but also by membrane morphology.