Abstract
The phase behavior of blends of hydrogenated terpene resin and polybutadiene with various 1,2-unit contents was investigated by customary cloud point measurements. UCST type phase diagrams were drawn for the seven polybutadienes for which 1,2-unit content was varied. The Flory-Huggins interaction parameters, χ ij , were determined by fitting the cloud points with binodal curves. By means of the mean field approximation, the locus of the UCSTs was simulated against copolymer composition, using the determined χ ij parameters. The new miscible concave curve, namely the miscibility valley, against copolymer composition at the critical blend composition was found in the present study
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