Macroscopic Viscosity and Dielectric Relaxation Process of Ethyl and Butyl Acetates

Abstract

Abstract Dielectric constants and losses have been measured at 9.8 GHz microwave frequency for ethyl and butyl acetates in benzene and benzene–paraffin oil mixtures at 18 °C. The data obtained has been analysed in terms of the two relaxation times τ(1) and τ2 using Higasi, Koga, and Nakamura method and their dependence on the viscosity has been examined. Since the observed values of τ(1)and τ(2) are significantly different, the systems studied represent two Debye type dispersions. It has been found that the relaxation behaviour giving rise to τ(1) in both the ester molecules is not effected to any appreciable extent by the increased macroscopic viscosity. The dielectric relaxation time τ(2) associated with the molecular process lengthens with the increasing macroscopic viscosity of the medium.