Interaction of poly(vinylpyrrolidone) with p‐substituted phenols in aqueous solution

Abstract

AbstractThe interaction of poly(vinylpyrrolidone) (PVP) with various p‐X‐substituted phenols (X = CH3O, CH3, C2H5, H, Cl, Br, and NO2) in aqueous solution was investigated by means of equilibrium dialysis at 30°C. By applying the Klotz equation for the results obtained, the bonding constants K between PVP and p‐substituted phenols were determined. It was found that the K values were approximately correlated with the Hammett σ values of p‐substituents in phenols, indicating that the bonding forces due to electrostatic and hydrogen‐bonding interactions were significant, and they increased with increasing electron‐withdrawing nature of the substituents. Therefore, in addition to the hydrophobic interaction which has been accepted, it was assumed that the above interaction forces also played an important role in the interactions between PVP and p‐substituted phenols in aqueous solution.