Physico-Chemical Studies of Anionic Surface Active Ionic Liquid in Aqueous Poly(vinyl pyrrolidone) (PVP) Solutions: Density and Speed of Sound Measurements

Density (ρ) and speed of sound (u) values were measured for environmentally safer surface active ionic liquid (SAIL) tetrabutylammonium dodecylsulphate (TBADS) in 0.0, 0.1 and 0.3% w/w [PVP] at various temperatures (293.15-313.15 K). The volumetric and acoustic parameters such as isentropic compressibility (κs), apparent molar volume (Vφ) and compressibility (κs,φ), intermolecular free length (Lf), relative association (RA), specific acoustic impedance (Z) and molar sound number ([U]) were calculated by utilizing density and speed of sound values. These parameters were valuable to understand the interactions accessible in TBADS-PVP-water system. The existence of hydrophilic/hydrophobic interactions for TBADS in aqueous PVP solution was suggested by the variations in volumetric parameters, which further supported by various calculated acoustic parameters. The interactional facts may be contemplated as functional tool to enhance the utility of SAIL-polymer in various technological, biomedical and industrial fields.