Multiple Relaxation Processes in Long Chain Molecules at Microwave Frequencies

Abstract

Abstract The permittivity ε′ and dielectric loss ε″ of octanoyl, undecanoyl, and lauroyl chlorides have been measured in benzene for five different concentrations varying from 0.02 to 0.10 wt fraction at three different microwave frequencies, viz. 3.31, 9.83, and 26.90 GHz at 35 °C. The static permittivity ε0 at 100 kHz and the high frequency limiting permittivity ε∞ have also been measured at the same temperature. The permittivity and dielectric loss at different frequencies have been plotted against concentration and their slopes have been used to draw normalised complex plane plots between (a′–a∞)/(a0–a∞) and a″/(a0–a∞) for these compounds. Such plots show a skewed arc dielectric behaviour. The values of distribution parameter β, characteristic relaxation time τ0, average relaxation time τav, and dipole moment μ have been reported for the first time. The relaxation mechanism in these three molecules has been explained on the basis of multiple relaxation processes.