Densities, viscosities, and refractive indices of binary mixtures of benzene with isomeric butanols at 30°C

The densities, rho, viscosities, eta, and refractive indices, n, of binary mixtures of benzene with 1-butanol, 2-methyl-1-propanol, 2-butanol, and 2-methyl-2-propanol, including those of the pure liquids, were measured over the complete composition range at 30degreesC. The dependence of rho, eta, and n on composition was checked by using an empirical relation. The experimental data were used to calculate excess molar volumes, V-E, deviations in viscosity, Deltaeta, excess free energies of activation of viscous flow, G*(E), deviations in refractive index, Deltan, apparent molar volumes, V-phi,(1) and V-phi,(2), and partial molar volumes, (V) over bar degrees(1) and (V) over bar degrees(2), of benzene in alcohols and alcohols in benzene, respectively, at infinite dilution. The variations of these parameters with composition and the effect of branching in alcohols were discussed from the point of view of intermolecular interactions in these mixtures.