Dielectric studies. Part 4.—Relaxation processes of four monoalkylbenzenes

Abstract

A microwave procedure of improved accuracy has been employed to study the dielectric absorption at 25°C of liquid toluene, ethylbenzene, isopropylbenzene, t-butylbenzene and their solutions in cyclohexane. Solutions of toluene in cyclohexane have been examined at 15, 40 and 60°C and also toluene in carbon tetrachloride at 25°C. All systems have definite distribution coefficients and all are characterized by an absorption that may be analyzed into two relaxation times, one associated with molecular re-orientation and a shorter relaxation time. Possible explanations for the latter are considered.