Abstract
The polystyrene (PS)+polyisoprene (PIP)+cyclohexane ternary system was further studied by light scattering and phase separation experiments, using for the PS component a sample whose molecular weight was about ten times higher than that used before. Cloud point curves and binodals of the present system were appreciably displaced toward the solvent apex and highly distorted, compared with the previous ones. The light scattering data were analyzed using our recent expression for the interaction function χ χ=ξ12χ11b(φ1)+ξ22χ22b(φ2)+2 ξ1ξ2χ12t(φ1, φ2) where χiib(φi) is the χ function for solvent 0+polymer i, with φi the volume fraction of polymer i and ξi=φi/(φ1+φ2), and χ12t represents the contribution due to the interaction between polymers 1 and 2. The χ function determined was found to be able to describe the observed binodals almost quantitatively. The present result for χ12t, along with that from our previous work, clearly demonstrates that χ12t must be treated as molecular-weight dependent.
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Tong, Z., Einaga, Y. & Fujita, H. Phase Equilibrium in Polymer+Polymer+Solvent Ternary Systems III. Polystyrene+Polyisoprene+Cyclohexane System Revisited. Polym J 19, 965–971 (1987). https://doi.org/10.1295/polymj.19.965
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DOI: https://doi.org/10.1295/polymj.19.965