Dielectric and thermodynamic properties in a binary mixture of dimethylene chloride with formamide

Abstract

The dielectric and thermodynamic properties of dimethylene chloride with formamide have been determined at 10, 15, 20 and 25°C using time domain reflectometry (TDR) for 11 different concentrations of the system. The dielectric properties viz. static dielectric constant (ε0) and relaxation time (τ) have been obtained by the least squares fit method with Debye model. The dielectric constant and relaxation time increase with increasing the mole fraction of formamide in dimethylene chloride of the system. The excess inverse relaxation time is found to be negative in the system and excess permittivities are found to be negative in dimethylene chloride and positive in the formamide rich region for all temperatures. The thermodynamic parameters such as free activation energy (ΔG), molar enthalpy of activation (ΔH) and molar entropy of activation (ΔS) have been determined.