Abstract
AbstractViscosity measurements afford data for the parameters governing the thermodynamic interaction between polymer and solvent. Viscosities of polydimethylsiloxane solutions were measured in several solvents at different temperatures with the object of examinating the effects of the geometrical and chemical nature of solvent on the thermodynamic interaction. The pair interaction heat and entropy parameters for polydimethylsiloxane solutions were derived from the intrinsic viscosity. It was found that the pair entropy parameters differes widely for polydimethylsiloxane in different solvents. The large variation in the entropy parameters may be attributed to the preferential ordering induced in solution in addition to the size and the shape of the solvent molecule.
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