Dielectric Relaxation Studies on Binary Polar Mixtures of Diethylene Glycol with Ethyl Benzoate Using Time Domain Reflectometry

It is interesting to study the nature of intermolecular interactions between associative and non-associative polar liquids. Dielectric relaxation measurements on polarpolar binary mixtures of ethyl benzoate with mono diethylene glycol were carried out for eleven different concentrations at temperatures (298K, 303K, 308K and 313K) using Time Domain Reflectometry (TDR) over the frequency range from 10MHz to 10 GHz. The Kirkwood correlation factor and excess dielectric properties were determined and discussed to yield information about the intermolecular interactions in binary system. The non-linear variation has been observed in relaxation time with increasing of alcohol mole concentration. The Bruggeman plot shows a deviation from linearity. This deviation was attributed to some sort of molecular interaction, which may take place between the ester and alcohol molecules. The excess static permittivity and excess inverse relaxation time values are negative for the studied binary systems, indicating the solute-solvent interaction to exist between ester and alcohol, producing a field in such a way that the effective dipole rotation is hindered.