Abstract
AbstractThe equilibrium phase behavior of the partially miscible system polystyrene‐polybutadiene‐chloroform was studied at 25°C and 1 atm pressure by using gel permeation chromatography to analyze the conjugate phases. Three narrow molecular weight distribution samples of each polymer were used to provide nine examples of the system for study. The Flory‐Huggins theory was used to determine the polymer‐polymer interaction parameter χ23, When literature values of the two polymer‐solvent interaction parameters χ12 and χ13 were used, the χ23 values generally were found to be negative and to show no distinct concentration dependence. No significant improvement was found when the literature value of only the polybutadiene‐chloroform interaction parameter was used to simultaneously generate values of χ23 and χ12. Values of χ23 at the critical point, χ23,cr, were found to increase with increasing polymer concentration.
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