Ionic Interactions of NaCl in Aqueous Polyvinyl Alcohol and Cross-Linked Polyvinyl Alcohol with Glutaraldehyde

Abstract

Electrical conductivity serves as the primary measure for assessing electrolytic interactions in solvents. Studies on conductivity in mixed solvents offer valuable insights into solute-solute and solute-solvent interactions, as well as solvent structure. Fewer studies have explored this phenomenon in mixed solvent systems. Therefore, the current study aims to demonstrate how the addition of a cross-linking agent impacts solvent system properties through conductivity analysis. Monovalent electrolyte NaCl blend with polyvinyl alcohol as polymer in the presence of cross linking agent glutaraldehyde were prepared using solution casting technique in the temperature range of 303–318K. The conductivity of solution of NaCl were measured to evaluate limiting molar conductance (Λ°m), degree of dissociation (α), dissociation constant (Kd), walden product, and energy of activation (Ea) for transport process as a function of concentration, solvent composition and temperature. The behavior of these parameters suggests strong ion-ion interactions in solvents. These measurements had been used to study the activation parameters for association of molar concentration of NaCl in aqueous polymer and cross-linked polymer of varying proportion. The different activation parameters such as energy of activation (Ea), enthalpy of activation (ΔH*), entropy of activation (ΔS*) and the Gibbs free energy of activation (ΔG*) for NaCl were estimated and compared the result of polymeric solvent system within temperature range of 303–318K.