Dielectric properties and analysis of H-bonded interaction study in complex systems of binary and ternary mixtures of polyvinyl alcohol with water and DMSO

Abstract

The dielectric relaxation properties and dipole ordering of binary mixtures of low molecular weight Poly Vinyl alcohol (PVA) with water (WAT) and ternary mixtures of PVA+WAT with Dimethylsulfoxide (DMSO) of different concentration have been measured at 298K using Time Domain Reflectometry (TDR) technique. The measured values of permittivity (ϵ′), dielectric loss (ϵ″), static dielectric constant (ϵ0) and high frequency limiting dielectric constant (ϵ∞) have been measured in frequencies 10MHz to 30GHz and used to determine the values of molecular relaxation time (τ), and excesses permittivity (ϵE) of the different composition of binary and ternary mixtures. The formation of H-bonded complexes between PVA and WAT molecules increases the number of dipoles of binary mixtures. The PVA+WAT mixture forms the strongest complexes corresponding to the various concentrations. The ternary mixtures indicate the existence of heterogeneous species of different characteristics and molecular interactions in dilute solutions. The ϵE values of the ternary mixtures confirm the increase in dipole number. This contributes the raise in dielectric constant values and formation of the ternary complexes. The ionic conductivity (σ) and activation energy (ΔF) justify that the electronic polarization is influenced by heterogeneous H-bond of complexes of both binary and ternary systems. The Kirkwood correlation factor (gf) and effective Kirkwood correlation factor (geff) indicates the dipole ordering of the binary and ternary mixtures. The comparative values of various binary and ternary mixtures of different composition suggest that the nature of heterogeneous interaction varies with the solvent. Variations of the constituent compositions in the binary and ternary mixture also identified.