Excess Properties and Spectroscopic Studies for Binary System of Polyethylene Glycol 200 (1) + Dimethyl Sulfoxide (2) at <i>T</i> = (298.15 to 318.15) K

This work reports density and viscosity data for binary system of polyethylene glycol 200 (PEG) (1) + dimethyl sulfoxide (DMSO) (2) over the whole concentration range at <i>T</i> = (298.15, 303.15, 308.15, 313.15, and 318.15) K as a function of composition under atmospheric pressure. From experimental density and viscosity data, the excess molar volume (<i>V</i>_m^E), viscosity deviation (Δη), the excess Gibbs free energies of activation for viscous flow (Δ­(<i>G</i>*)^E), and the apparent molar volumes (<i>V</i>_φ,<i>i</i>) were calculated. The <i>V</i>_m^E, Δη, and Δ­(<i>G</i>*)^E were fitted to a Redlich–Kister equation to obtain the coefficients and to estimate the standard deviations between the experimental and calculated quantities; meanwhile, based on the kinematic viscosity data, the viscous flow thermodynamic parameters were also calculated. In addition, based on FTIR and UV–vis spectra for the binary system of PEG (1) + DMSO (2) with various concentrations, the intermolecular interaction of PEG with DMSO was discussed