Viscosity, density, electric conductance and activation parameters of viscous flow for sodium salicylate in aqueous poly (vinyl alcohol) solution

Viscosity, density and electric conductance of the solution of sodium salicylate + poly (vinyl alcohol) + water at the temperatures 293.15, 298.15, 303.15, 308.15 and 313.15 K are measured experimentally. The partial molar volume, the molar conductance at infinite dilution, and the activation parameters of viscous flow were obtained. An approximately linear relation between the activation free energy of viscous flow and the molar conductance at infinite dilution is observed. Our result shows that, although PVA increases the viscosity of the medium, the diffusivity of ions does not decrease, the solvation volume of salt at infinite dilution changes little. Therefore, the increase in diffusivity is connected with the decrease in the free space of ion moving when PVA is added into water.