The 2-methoxyethanol+1,2-dimethoxyethane plus water ternary system. Staticrelative permittivities from-10 to+80 degrees C

Static relative permittivities of the 2-methoxyethanol + 1,2-dimethoxyethan e + water ternary solvent system were measured as a function of temperature (-10 less than or equal to t/degreesC less than or equal to 80) and of com position, over the whole molar fractions range 0 less than or equal to x(1) , x(2), x(3) less than or equal to 1. The experimental values have been use d to test some empirical relationships accounting for the dependence of eps ilon on T. x(i), and on T, x(i) couples of values. A comparison between cal culated and experimental data shows that these relationships can be profita bly employed to predict E values in correspondence to experimental data gap s. The excess dielectric permittivity, epsilon (E), assumes, in the most ca ses, negative values for any compositions of the mixtures. while the values of the excess molar polarization, PE, are positive. The large values of th e excess quantities are indicative of the strong specific interactions amon g similar, as well as different molecules in the mixtures. Discussion of th e data in terms of Kirkwood correlation factor also gives information on th e short-range intermolecular interactions among the components. suggesting the formation of two-components adducts rather than of than mure complex mo ieties involving all three molecular species.