Volumetric, ultrasonic and viscometric studies of molecular interactions in binary mixtures of aromatic+aliphatic alcohols at different temperatures

Abstract

The densities, ρ, ultrasonic speeds, u and viscosities, η of pure benzyl alcohol, 1-propanol, 2-propanol and those of their binary mixtures, with benzyl alcohol as a common component, have been measured at 298.15, 303.15, 308.15 and 313.15 K over the entire composition range. The excess molar volume, V E, deviation in isentropic compressibility, Δk s , excess thermal expansivity, αE, deviations in ultrasonic speed, Δu and viscosity, Δη, partial molar volume and compressibility, and of 1-propanol/2-propanol in benzyl alcohol at infinite dilution have been evaluated from the experimental data. The results have been used to discuss the nature and strength of intermolecular interactions in these mixtures. The V E values have also been calculated theoretically by using the Flory's statistical theory and Prigogine–Flory–Patterson theory. The calculated V E values were found in good agreement with the experimental V E values. The thermal expansivity, α and isothermal compressibility, k T have been calculated theoretically by using Flory's theory and various hard sphere models, and were compared with experimental α and k T values.