Dielectric Studies. XVI. Relaxation Processes of Some Molecules Containing the C6H4 Nucleus

Abstract

The dielectric absorption of benzocyclobutene, 2‐bromonaphthalene, o‐dichlorobenzene, m‐dichlorobenzene, indane, 1‐methylnaphthalene, 2‐methylnaphthalene, tetralin, o‐xylene, and m‐xylene in cyclohexane solution has been examined. All the dielectric data were analyzed in terms of a Cole‐Cole distribution, and where appropriate, the data were further analyzed into contributions from two relaxation times. Tetralin at 15° and 25°C showed a nonzero distribution coefficient $\mathrm{(\alpha )}$ ; at 50°C its $\alpha$ was zero and this was also the case for benzocyclobutene, indane, o‐dichlorobenzene, and $m$ ‐dichlorobenzene at 25°C. A short relaxation time process, together with that of molecular reorientation, contributes to the dielectric absorption of the methyl‐substituted compounds and may also be present in the benzocyclobutene, indane, and tetralin solutions. The short relaxation time for the aromatic hydrocarbons may be accounted for by an intermolecular relaxation process.