Macroscopic viscosity and the dielectric relaxation of some substituted benzenes

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Abstract
Microwave dielectric constants and losses, and viscosities (η) have been obtained for acetophenone, anisole, bromobenzene, and p-dimethoxybenzene in n-heptane, n-hexadecane, paraffin oil, and three n-heptane + paraffin oil mixtures between 15 and 60 °C. The dielectric results have been analyzed for mean relaxation times (τ0). Plots of ln τ0T against ln η for bromobenzene are compared with those for the other solutes in an attempt to determine the effect of contributions from intramolecular relaxation processes. The results suggest that measurements employing several solvents at one temperature provide a better insight into mechanisms of dipole reorientation than those with one solvent at several temperatures.

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