Investigation of Volumetric and Acoustical Properties of Polyethylene Glycols in Niacin Solutions

Using the Anton- Paar DSA 5000 M, the density and sound speed of polyethylene glycols (polyethylene glycol 400; polyethylene glycol 4000) in an entire range of concentrations (0.07, 0.08, and 0.09) mol.kg-1 aqueous solutions of vitamin B3 (niacin) were measured at constant experimental pressure 0.1 MPa and temperature ranges (288.15 K, 298.15 K, 308.15 K, and 318.15 K). These experimental results were used to measure acoustic and thermodynamic parameters such as acoustic impedance, adiabatic compressibility, intermolecular free length, Wada's constant, Rao's constant, and Vander Waal's constant, which provided insight into the intermolecular interactions within the ternary mixture of niacin and polyethylene glycols (PEG 400and 4000).