Dielectric relaxation of binary systems of some disubstituted fumarates with acrylonitrile and vinylacetate in CCl 4 solutions

Abstract

The dielectric absorption of binary mixtures of some dialkyl fumarates namely dimethyl fumarate (DMF), diethyl fumarate (DEF), diisopropyl fumarate (DIPF), dinonyl fumarate (DNF), and didodecyl fumarate (DDF) with either acrylonitrile (AN) or vinylacetate (VA) with different mole fractions in dilute solutions of carbon trachloride has been measured in the microwave region (0.2–18 GHz). The data were analyzed by the sum of two Debye terms (or even one term). The relaxation times obtained were found to describe the orientation of the molecule as whole and studied as a function of the mole fraction. Some deviation from linearity was detected This deviation is discussed in terms of the molecular interaction which is expected to take place between the investigated fumarates with acrylonitrile and vinylacetate. The systems contain vinylacetate were found to possess higher interaction when compared with those of acrylonitrile. This presumption finds further justification through the values of equilibrium constant K by means of the dielectric polarization measurements.