Abstract
Abstract Dielectric constant and loss data have been obtained at up to eight frequencies between 1 and 16GHz for five parasubstituted benzenes in o-terphenyl at a few temperatures above the melting point. The data have been analyzed for mean relaxation times, τ o , and some estimates have been made of the enthalpy of activation for the molecular process and in two cases for the intramolecular process. In the case of p-methylanisole in o-terphenyl the work indicates a contribution from both the molecular (τ 1 ) and the intramolecular (τ 2 ) relaxation processes whereas microwave studies on this solute in p-xylene revealed only an intramolecular process. In general, a more viscous solvent seems of good potential for dielectric studies of flexible molecules. The solutes examined here have a much greater τ 1 /τ 2 ratio than with solvents of appreciably lower viscosity. Such a higher ratio should lead to a more favourable analysis for molecules in which molecular orientation makes a smaller contribution to the dielectric absorption.
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