Abstract
The Flory–Huggins interaction parameter χ was formulated as a function of concentration, temperature, and chain length (P) on the basis of light scattering data for two monodisperse polyisoprene samples in dioxane in the region encompassing the θ temperature. It was found that when extrapolated to the immiscibility region, the resulting χ predicts binodals, spinodals, and critical points which agree almost perfectly with observed results. Another important finding is that χ depends distinctly on P even at high concentrations where chain overlapping takes place.
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Takano, N., Einaga, Y. & Fujita, H. Phase Equilibrium in the Binary System Polyisoprene + Dioxane. Polym J 17, 1123–1130 (1985). https://doi.org/10.1295/polymj.17.1123
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DOI: https://doi.org/10.1295/polymj.17.1123