Static dielectric constants of 1,2-dichloroethane + 2-methoxyethanol + 1,2-dimethoxyethane ternary liquid mixtures from −10 to 80°C

Static dielectric constants (ε) were measured for mixtures of 1,2-dichloroethane (DCE, 1) + 2-methoxyethanol (ME, 2) + 1,2-dimethoxyethane (DME, 3) at 19 temperatures in the range −10 ≤ t/°C ≤ 80, employing 12 ternaries covering the whole composition range expressed by the mole fractions 0 < X1, X2, X3< 1. Empirical fitting equations of the type ε = ε(T), ε = ε(Xi) and ε = ε(T,Xi), which might be useful for correlation and interpolation procedures, were used to represent the experimental data. The excess mixing property εE has been evaluated to investigate the presence of solvent-cosolvent adducts at each temperature. The quantity εE has been found to be partly positive and partly negative in the ternary domain {X1, X2, X3}. As a consequence, it is possible to observe an isoline at εE = 0 at each temperature. Such a line represents a large set of ternary mixtures having a pseudo-ideal dielectric behavior, even being formed by interacting components.