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The thermodynamic properties of dextran (DEX) in aqueous solutions were studied by light-scattering, membrane osmometry, and isopiestic measurements. Five polymer samples of weight-average molecular mass between about 40 000 and 500 000 were investigated at temperatures between 293 K and 303 K. The experimental results are described with application of the osmotic virial equation. It was found that the new experimental data, as well as the literature data, can be described using second and third virial coefficients which do not depend on the molecular mass of the dextran.

Thermodynamic properties of poly(vinylpyrrolidone) (PVP) were studied by laser-light-scattering, membrane osmometry, and isopiestic measurements. Four polymer samples of weight-average molecular mass between about 9000 and 1 200 000 were investigated at temperatures from (278 to 333) K. The experimental results are described with application of the osmotic virial equation and compared to literature data.