Thermodynamic properties of aqueous dextran solutions from laser-light-scattering, membrane osmometry, and isopiestic measurements

The thermodynamic properties of dextran (DEX) in aqueous solutions were stu died 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 e quation. It was found that the new experimental data, as well as the litera ture data, can be described using second and third virial coefficients whic h do not depend on the molecular mass of the dextran.