Viscosities and densities for propylene carbonate + toluene have been measured at 15,20,25,30, and 35 °C. The "interaction parameter" obtained from the Grundberg and Nissan equation, the deviation in viscosity ( ), and excess volume (Vs) are discussed.

The relative permittivities, εr, and refractive indices, n D, have been measured over the whole composition range for binary mixture propylene carbonate + toluene at temperatures from 283.15 K to 313.15 K. The relative permittivity of the mixture increased monotonically by addition of propylene carbonate. Calculated deviations in relative permittivity, Δεr, were always negative showing a minimum. From the values of εr and n D, the molar polarizability, P m, has been calculated from the Kirkwood−Fröhlich equation and the deviation in molar polarizability, ΔP m, has been estimated. Molar refractivity, R m, was also calculated.

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Densities, relative permittivities, and refractive indices of propylene carbonate + p-xylene mixtures at (15, 20, 25, 30, and 35) °C were measured. Excess molar volumes were calculated, as well as deviations in relative permittivity and molar refraction. All the above quantities were found to be negative.

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