Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Relative permittivity and density on mixing at atmospheric pressure and temperatures from (288.15 to 328.15) K have been measured over the whole composition range for {CH3O(CH2CH2 O)mCH3 m = 1, 2 (also called monoglyme and diglyme) + n-nonane}. Excess permittivity and molar volume on mixing for the above systems have been calculated. The Redlich Kister equation has been used to estimate the binary fitting parameters and standard deviations from the regression lines were calculated. The density and excess molar volume were fitted to a polynomial equation as a function of the mole fraction and temperature. The temperature dependences of derived magnitudes, and , were computed, due to its importance in the study of specific molecular interactions. Different mixing rules have been applied to predict the permittivity of these mixtures and the results indicate that the predictions are better when the volume change on mixing is incorporated in calculations. In order to determine the dipolar moment of the glymes using Debye s model at infinite dilution, their refraction index was measured. The values obtained agree with those in the literature for infinite dilution in hexane.