Density, viscosity, surface tension and spectroscopic studies for the liquid mixture of tetraethylene glycol + N,N-dimethylformamide at six temperatures

Density ( ρ ), viscosity ( η ) and surface tension ( γ ) are always significant physicochemical properties for liquid mixtures. In this work, the ρ , η and γ data for the liquid mixture of tetraethylene glycol (T 4 EG) +  N , N -dimethylformamide (DMF) were systemically measured from 293.15 to 318.15 K with a step of 5 K and p  = 0.1 MPa. From these physicochemical properties, viscosity deviation ( ∆η ), excess molar volume ( V m E ), and surface tension deviation (∆ γ ) were calculated. Meanwhile, V m E , ∆η and ∆ γ of activation functions were fitted with Redlich-Kister (R-K) equation to evaluate the coefficients and standard deviations. The η values of the liquid mixtures were fitted with Grunberg and Nissan equation and three-body McAllister expression. UV–vis and FTIR spectra were measured to discuss the intermolecular interaction of T 4 EG with DMF, which indicated that there was hydrogen bonds interaction between hydroxyl hydrogen atoms in T 4 EG and oxygen atoms in DMF.