Funct. Mater. 2023; 30 (3): 387-392.
About phase separation of aqueous polymeric two-phase dextran-polyvinylpyrrolidone systems
Baku State University, 23 Z.Khalilov Str., AZ-1148 Baku, Azerbaijan
The effect of the polyvinylpyrrolidone molecular weight on the phase separation of an aqueous two-phase dextran-PVP system has been studied. Mathematical expressions of concentration dependences CPVP versus CDex for the two-phase systems formed by dextran and polyvinylpyrrolidone of various molecular weights are obtained. It is shown that all these dependences are described by the generalized equation CPVP = K·e-αCDex which makes it possible to construct binodal curves of these systems without experiments. It has been established that for polyvinylpyrrolidones with high molecular weights, phase separation in the systems occurs at lower concentrations of phase-forming components. Thus, the results of the study confirm the fundamental role of water in the processes of phase separation of the polymer-polymer-water system. To elucidate the mechanism of the influence of various external factors on the compatibility of polymers in a common solvent, the influence of temperature on phase separation in the dextran-PVP-water two-phase system has been studied. The interaction parameters between the components of the system are calculated, the differences between these parameters (Δχ = χ P 1 - H2O - χP2-H2O) are determined, and the dependence of the effect on temperature is studied. With increasing temperature, the effect decreases and at the same time, the compatibility of polymers in aqueous solution improves.
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