Abstract
The phase diagram of a system consisting of poly(acrylic acid) partially neutralized by NaOH (PAA-Na), poly(vinyl alcohol) (PVA), and water was determined as a function of molecular weight and carboxyl group content of PAA-Na. As in the case of poly(acryl-amide) with carboxyl groups–PVA–water system studied previously, incorporation of carboxyl (COOH) groups into the polyelectrolyte caused anomalous behavior in the phase diagrams. Thus, an increase in the molecular weight of PAA-Na at a fixed COOH content enhanced the miscibility of the mixture. A simple theoretical model based on the Voorn–Veis theory was applied to the phase behavior of the present system. It was found that the theory can qualitatively explain the COOH content dependence of the miscibility, but fails to predict the experimental dependence of the phase diagram on the molecular weight of the polyelectrolyte.
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Minh, L., Nose, T. Phase Equilibrium of Poly(acrylic acid) Partially Neutralized by NaOH–Poly(vinyl alcohol)–Water System. Polym J 15, 145–151 (1983). https://doi.org/10.1295/polymj.15.145
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DOI: https://doi.org/10.1295/polymj.15.145