Polymer cosolvent systems Conformational transitions of the polymer chain are observed as the mixture composition changes. (1988) Preferential Solvation in Polymer Cosolvent Systems: Polystyrene+Cyclohexane + Ethanol and Poly(vinyl-2-pyridine) + Nitromethane + Carbon Tetrachloride. F.Viras, K.Viras, J.Polym.Sci. Polym. Phys. 26, 2525-2533.