Refractive Indices and Relative Permittivities of Liquid Mixtures of γ-Butyrolactone, γ-Valerolactone, δ-Valerolactone, or ε-Caprolactone + Benzene, + Toluene, or + Ethylbenzene at 293.15 K and 313.15 K and Atmospheric Pressure

Abstract

The refractive indices, nD, and relative permittivities, ε, have been measured for the binary liquid mixtures of γ-butyrolactone, γ-valerolactone, δ-valerolactone, or ε-caprolactone + benzene, + toluene, or + ethylbenzene over the whole composition range at 293.15 K and 313.15 K and atmospheric pressure. For the pure lactones the dipole moments, μ, the molar polarizability, PM, and the molar refractivity, RM, were determined. From the values of ε and nD of the lactone + benzene mixtures, the Kirkwood correlation factor, g, was calculated indicative of the structures of the mixtures.