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On the Molecular Weight Dependence of the Second Virial Coefficient of Polystyrene in Toluene

The molecular weight dependence of the second virial coefficient A2 was measured osmometrically for polystyrene in toluene at 3°C in the molecular weight range of (6.6—445)×103 and compared with the results of our previous light scattering measurements. It was found that for M (molecular weight)>4.5×104, A2osm and A21s agreed fairly well. However for M<3×104 the former was much larger than the latter and followed the relation A2=0.964 M−1/2−4.36×10−3.