Investigation of dielectric relaxation processes in polar molecules introduced into a polymer matrix

Abstract

The dielectric properties of mixtures of chlorobenzene, chloroform and acetonitrile with transformer oil and two divinyl stereoregular rubbers with molecular masses of 8000 and 40,000 have been studied in the frequency range 1–10 10 Hz and in the temperature range −180∓100°C. It has been established that dielectric relaxation processes similar to the dipole group and cooperative (dipole-segmental) processes in polymers may be observed in the mixtures investigated. It has been shown that the temperature dependence of the relaxation time for the cooperative processes in the mixtures investigated obeys the equation where τ 0 is a pre-exponential factor, T g is the glass temperature and U is the activation energy for cooperative processes of dipole relaxation. It has been established that the values of U and τ 0 do not depend on the concentration of the polar molecules in the polymeric matrix but are determined by their physical and chemical nature and structure.