Physicochemical properties and spectral studies of the 1,3-butanediol + dimethyl sulfoxide binary system at T = (293.15–318.15) K

Abstract

ABSTRACTThis work reports experimental dynamic viscosity (η) and density (ρ) for 1,3-butanediol (BTD) (1) and dimethyl sulfoxide (DMSO) (2) binary systems at T = (273.15–318.15) K and p = 0.1 MPa. From the experimental ρ and η data, the excess molar volumes () values, viscosity deviation (∆η) values, partial molar volumes ( and ) values, apparent molar volume (Vφ,1 and Vφ,2) values, excess free energies of activation () values and isobaric thermal expansion coefficient (αp) values were, respectively, obtained. After that, a Redlich–Kister equation was used to fit , ∆η and values. The mixtures exhibited positive with a maximum at x1 = 0.55, which became more pronounced after temperature increased. The obtained standard deviations (σ) values were compared with literature data and conclusion about application modus was drawn. From FTIR, UV–vis, FTIR and NMR spectral information, intermolecular interaction between BTD and DMSO was systemically explored.