By using the Flori-Huqqins theory for polymer solutions the thermodynamic parameters of interaction between phase-forming components of two-phase systems dextran-polyvinylpirrolidone-water were calculated. It is obtained, that the dextran-polyvinylpirrolidone interaction parameter does not change and is very small, but the interaction parameters for dextran-water and polyvinylpirrolidone-water are sufficiently large and are chainged by correlation dependence. The interaction parameters between the components polyethylene glycol-C4O6H4Na2-H2O were calculated. The obtained results confirms that the Flory-Huggins theory is applicable for water solutions of polymers.
Flory-Huggins theory, incompatibility of polymer, two-phase systems water-polymer, phase separation
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