Static dielectric constants of 1,2-dichloroethane + 2-methoxyethanol + 1,2-dimethoxyethane ternary liquid mixtures from −10 to 80°C
文摘
Static dielectric constants (œ) 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 œ = œ (T), œ = œ(Xi) and œ = œ(T,Xi), which might be useful for correlation and interpolation procedures, were used to represent the experimental data. The excess mixing property œE has been evaluated to investigate the presence of solvent-cosolvent adducts at each temperature. The quantity œE 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 œE = 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.