The Mechanism of Dissolution of Water-soluble Polymer------Partially Acetylated Poly(vinyl alcohol)------in Water

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Bibliographic Information

Other Title
  • 水溶性高分子――ポリビニルアルコールの部分アセチル化物――の溶解機構

Description

Aqueous solutions of partially acetylated pely(vinyl alcohols) (hereinafter is abbreviated as PVA-Ac) split into two phases above the cloud points. The cleud point curves, i. e., the liquid-liquid solubility curves of PVA-Ac vs. water has been determined. The cloud points were depressed by the added salts just as the aqueous solutions of nonionic surfactants. The cloud point curve of PVA-Ac-H20 system was influenced marked1y by the saponificatien degree but not infiuenced appreciabiy by the degree of polymerization of PVA-Ac.<BR>It was found that the vapor pressure of water in aqueous solution of PVA-Ac stays nearly constant up to 40 wt% solution and then rapidly decreases. This fact is an impressed evidence that an aqueous solution of PVA-Ac is similar to the microscopic two phase mixture of water and water swollen polymer.<BR>This system affords an interesting example that the dissolution proceeds by the orientation, arrangement and sti u: ture formation of water soluble polymers.,

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (6), 1134-1137, 1974-06-10

    The Chemical Society of Japan

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