Determination of solubilities of polymers in solvents by a laser scattering technique

A newly developed laser light scattering technique was tested for the determination of cloud-point curves in polystyrene+cyclohexane and in polystyrene+methyl acetate systems at moderate pressures. The solubility data were determined for molecular weights of polystyrene of M×10−4=9.0 and 19.0 for the cyclohexane system, and of M×10−4=70.6 for the methyl acetate system at temperatures up to upper critical solution temperature. The experimentally determined cloud points were satisfactory correlated by Flory type models.