Dielectric Properties in Ternary Mixtures of Ethane-1,2-diol + 1,2-Dimethoxyethane + Water

The static dielectric constant (ε) of ethane-1,2-diol + 1,2-dimethoxyethane+ water ternary mixtures was measured as a function of temperature (263.15 T (K) 353.15) and composition, over the complete mole fraction range 0 x1, x2, x3 1. The experimental values were analyzed by empirical relationships that accouInted for the dependence ε=ε(T ) and Y =Y(xi ). A comparison between calculated and experimental data shows that these fitting relationships can be reliably used to predict ε values, along with other related properties, in areas of experimental data gaps. Starting from the experimental measurements, some derived quantities such as molar orientational polarization (P), dipolar iInteraction free energy (Fμ) and the relevant thermodynamic excess mixing properties (FE μ , F E μ,i ), were obtained. The values of the excess quantities are indicative of the presence of specific iInteractions between different components in the mixtures. A discussion of data in terms of the Kirkwood theory also provides information on the short-range iIntermolecular iInteractions, suggesting the formation of stable two-component adducts rather than of more complex moieties involving all three molecular species.