Molecular Weight Investigation Of Polystyrene By Light Scattering, Osmometry, And Viscosity Measurements

Polystyrene can be precipitated from a toluene solution by the addition of methanol as the non-solvent. This procedure executed step by step will cause the polymer to precipitate into fractions in order of decreasing molecular weight. Seven fractions were obtained in the above manner with an eighth one being recovered by evaporation of the solution.