Abstract
The coexistence curves of dilute solutions of Poly(vinyl methyl ether) (PVME) in a solvent mixture methanol/cyclohexane which has a critical demixing point were measured. We found that in the methanol-rich region the presence of a small amount of PVME does not cause any appreciable change in the phase boundary of binary methanol/cyclohexane mixture, whereas in the cyclohexane-rich region it gives rise to a marked shift of phase boundary toward higher temperature region. It is shown that this characteristic phase behavior can be well explained qualitatively on the basis of Flory–Huggins solution theory, together with the interaction parameters deduced from small angle neutron and X-ray scattering experiments, as due to the smallness of the interaction parameter, χ13, between methanol and PVME. The smallness of χ13 can be interpreted as a manifestation of the association of methanol molecules.
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Takada, M., Okano, K. & Kurita, K. Coexistence Curve of Dilute Polymer Solution in a Mixed Solvent Having Critical Demixing Point. Polym J 26, 113–120 (1994). https://doi.org/10.1295/polymj.26.113
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DOI: https://doi.org/10.1295/polymj.26.113
