Microwave absorption and relaxation processes of ternary mixtures of non-rigid polar liquids

Abstract

The dielectric absorption of three acrylates and their mixture compositions as liquid dielectric samples have been studied at MW frequency 9.132 GHz in dilute solution of carbon tetrachloride in the temperature range 300-330 K. Different dielectric parameters like dielectric constant ɛ′ and dielectric loss ɛ′′ at microwave frequency, dielectric constant ɛ_δ at static frequency and dielectric constant ɛ_∞ at optical frequency have been determined. Using these dielectric data, distribution parameter α, various relaxation times, viz. <img src='/image/ spc_char/tow.gif' border=0>₀, <img src='/image/ spc_char/tow.gif' border=0>₁, and <img src='/image/ spc_char/tow.gif' border=0>₂ of individual components and their ternary mixture compositions have been calculated. Thermo dynamical parameters like molar energy of activation Δ<i>F</i>_ɛ<i> </i>molar enthalpy of activation Δ<i>H</i>_ɛ and molar entropy of activation Δ<i>S</i>_ɛ have been evaluated by considering the relaxation as the rate process. Variation of In (<img src='/image/ spc_char/tow.gif' border=0>₂<i>T</i>) versus 1/<i>T </i>indicates exponential decay of relaxation time with temperature for dielectric relaxation process. The relaxation time values for single component solutions agree well with literature values while relaxation times of ternary mixture compositions are consistent with the computed values obtained from various theoretical relations.