Viscosity Study of Molecular Association in Binary Mixtures of Acetone with Some Aromatic Hydrocarbons at Different Temperatures

Abstract

The viscosities η, and refractive indices, n, of binary mixture for acetone +benzene, +toluene, +p-xylene and +mesitylene, cover the whole mole fraction range have been measured at 298.15, 303.15, 308.15, 313.15, and 318.15 K. From the experimental data, the deviations in viscosity, Δη, and deviations in molar refraction, ΔRm, have been calculated. The variation of these parameters with composition and temperature of the mixtures have been discussed in terms of molecular interaction. The effect of the number of the methyl groups in these aromatic hydrocarbons on molecular interactions has been discussed. The free energies ΔG*, enthalpies ΔH*, and entropies ΔS*, of activation of viscous flow have also been obtained using Eyring viscosity equation. The ΔH* values were found independent of temperature.