Abstract
The concentration dependences of three χ parameters (thermodynamic interaction parameters of solvent 1—2, solvent 1-polymer, and solvent 2-polymer; χ12, χ13, and χ23, respectively) were studied for developing a theory of the two-phase equilibrium of a quasi-ternary system which consists of multicomponent polymers and a binary solvent mixture. χ12, χ13, and χ23 were defined by
where χ120, χ130, and χ230 are tne parameters independent of the total polymer concentration vp and are dependent on the temperature only, and p12,1, p13,1, and p23,1 are the concentration dependent parameters. Computer experiments on solutions of an original polymer with the Schulz–Zimm type molecular weight distribution (the ratio of weight- to number-average molar volume of the polymer to the solvents Xw0/Xn0=2.0 and Xw0=300) were carried out to study the effects of concentration dependent parameters on the two phase equilibrium characteristics. Partition coefficient σ, phase volume ratio R, and polymer volume fraction in polymer rich phase vp(2) increase with an increase in p13,1 and p23,1 and yield maximum near p12,1=−0.2. The effects of the concentration dependence of χ-parameter on σ, R, and vp(2) decrease in the following order: p23,1>P13,1>p12,1.
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Matsuda, S. Phase Equilibria of Quasi-Ternary Systems Consisting of Multicomponent Polymers in a Binary Solvent Mixture V. Effects of Concentration Dependence of Thermodynamic Interaction Parameters. Polym J 18, 993–1016 (1986). https://doi.org/10.1295/polymj.18.993
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DOI: https://doi.org/10.1295/polymj.18.993