DIELECTRIC BEHAVIOR OF THE 2-METHOXYETHANOL-1,2-DIMETHOXYETHANE SOLVENT SYSTEM

The static relative permittivity at various temperatures ranging from -10 to +80-degrees-C has been measured for 2-methoxyethanol, 1,2-dimethoxyethane and nine mixtures covering the whole miscibility field expressed by the mole fraction of 2-methoxyethanol (0 less-than-or-equal-to X1 less-than-or-equal-to 1). Equations describing the dependence of the relative permittivity on temperature [epsilon = epsilon(T)], and binary composition [epsilon = epsilon(X1)], have been checked. Furthermore, a single function epsilon = epsilon(T, X1) has been obtained by combining the previously cited monovariant equations. As a rule, the calculated values agree very well with the experimental ones. The excess extrathermodynamic parameter epsilon(E), which provides much useful information about the possibility of forming solvent-cosolvent complexes is briefly discussed. This fact has been interpreted on the basis of specific interactions of any kind between different molecules, taking into account geometric effects and steric hindrances.