Phase relationships of an equivalent mixture of sulfated polyvinyl alcohol and aminoacetalyzed polyvinyl alcohol in microsalt aqueous solution

Abstract

Abstract A new type of polymer salt was prepared from an equivalent mixture of partly sulfated polyvinyl alcohol (polyanion, Q − ) and partly aminoacetalyzed polyvinyl alcohol (polycation, P + ). With respect to a three‐component system composed of this polymer salt (P + Q − ), water, and a microsalt (K + A − ), phase relationships, as represented by complex coacervation, were investigated. Experimental results were discussed according to a theoretical equation for the free energy of mixing derived by taking into account the entropy and enthalpy contributions as ascribed for non‐ionic polymer solution, and the electrostatic free energy expression as derived by Voorn.