The dielectric relaxation study of 2(2-alkoxyethoxy)ethanol–water mixtures using time domain reflectometry

Abstract

Complex permittivity spectra of 2(2-alkoxyethoxy)ethanol–water mixtures for the entire concentration range and at 25 °C have been measured using time domain reflectometry technique up to 30 GHz. The relaxation processes have been obtained by fitting the complex permittivity spectra of the binary mixtures in 2-Debye equation. In glycol ether–water mixtures except for pure water and its rich region the double relaxation times, primary process (τ 1) and secondary process (τ 2) have been observed. The primary relaxation process (τ 1) may be due to cooperative relaxation of the H-bond network of mixture constituents and the secondary relaxation process (τ 2) may be due to its flexible parts attached to the carbon chain. The intra and intermolecular hydrogen bonding of 2(2-alkoxyethoxy)ethanol in pure form as well as in binary mixtures of water have been discussed using Kirkwood correlation factor, Excess dielectric properties and the Bruggeman factor.