Dielectric relaxation study of aqueous ethylene glycol mono-methyl ether (EGME) with water using time domain reflectometry technique in the frequency range 10MHz to 50GHz

Abstract

The Complex permittivity spectra of glycol ether (GE) compounds such as ethylene glycol mono-methyl ether (EGME) with water mixture over entire concentration range and in temperature range of 10–25∘C have been determined using Time Domain Reflectometry (TDR) technique in the frequency range 10MHz to 50GHz. The complex permittivity spectra for EGME-water were fitted in the Cole–Davidson model. The Static dielectric constant (ε0), Relaxation time (τ), effective Kirkwood correlation factor (geff), excess permittivity (ε0E), thermodynamic parameters (activation enthalpy and activation entropy) and Bruggeman factor (fB) have been calculated by the nonlinear least square fit method. The intermolecular interactions between EGME-water binary mixtures suggest the nonlinear behavior of dielectric parameters. The contribution of hydrogen bonding interactions among the solute–solvent mixtures is confirmed by Excess properties and Bruggeman factor.

Keywords

• ethylene glycol mono-methyl ether
• complex permittivity
• kirkwood correlation factor
• excess dielectric properties
• thermodynamic parameters
• bruggeman factor