Density, Viscosity, and Spectroscopic Nature for the Binary System of Tetraethylene Glycol (1) + Water (2) T = (298.15 to 323.15) K

Densities and viscosities for the binary system of tetraethylene glycol (1) + water (2) at T = (298.15 to 323.15) K were measured as a function of composition under atmospheric pressure. The excess properties, including excess molar volumes ( $$V_{{\text{M}}}^{{\text{E}}}$$ ), viscosity deviations (Δη), and the excess Gibbs free energy of activation for viscous flow (ΔG*E) were calculated by using density and viscosity data, respectively. Excess properties indicated that there are hydrogen bonding interactions between tetraethylene glycol and water molecules, which are investigated in detail by FTIR and UV–Vis spectra.