Abstract
Incipient phase, isolated at cloud point from quasi-binary solution consisting of multicomponent polymers in a single solvent, was named “cloud particle” and an attempt was made to clarify the concentration and the composition (i.e., the molecular weight distribution) of the polymer in the cloud particle as a function of initial polymer volume fraction vp0. For this purpose, a theoretical method for direct calculation of the cloud point curve was employed considering concentration- and molecular weight-dependences of the polymer-solvent interaction parameter χ. In order to compare characteristics (the concentration and composition of polymer) of two-phase equilibrium for ρp>0 (ρp, the relative amount of polymer partitioned in a polymer-rich phase) with those of the cloud particle (two-phase equilibrium for ρp=0), two-phase equilibrium for ρp>0 was calculated under the same conditions as those of cloud particle. Computer experiments of the cloud particle were also carried out in the range of XW0/Xn0=1.1—4, XW0=3×102—5×103(Xw0 and Xn0 are number- and weight-average of the molar volume ratio of polymer to solvent of original polymer, respectively), p2=0—0.8, and p2=0—0.4 (p1 and p2, 1st and 2nd order concentration dependent parameters). With a decrease in XW0 and an increase in p1 and p2, polymer concentration of the cloud particle increases.
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Matsuda, S. Phase Equilibria Characteristics at and near Cloud Point of Quasi-Binary System Consisting of Multicomponent Polymers in a Single Solvent. Polym J 18, 981–992 (1986). https://doi.org/10.1295/polymj.18.981
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DOI: https://doi.org/10.1295/polymj.18.981