Studies on thermodynamic and transport properties of binary mixtures of acetonitrile with some cyclic ethers at different temperatures by volumetric, viscometric, and interferometric techniques

Densities and viscosities of the binary mixtures of acetronitrile with tetrahydrofuran, 1,3- dioxolane, and 1,4dioxane were measured over the entire range of composition at ( 298.15, 308.15, and 318.15) K. Ultrasonic speeds of these binary mixtures have also been measured at 298.15 K. From the experimental data, values of excess molar volumes ( V-E), viscosity deviations (Delta eta), and deviations in isentropic compressibility ( Delta K-s) have been calculated. These results were fitted to Redlich- Kister polynomial equation. The density and viscosity data were analyzed by some semiempirical viscosity models, and the results have been discussed in terms of molecular interactions and structural effects. The excess properties were found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures. To explore the nature of the interactions, various thermodynamic parameters ( e. g., intermolecular free length, specific acoustic impedance, etc.) have also been derived from the density and ultrasonic speed data.