Excess properties and spectroscopic studies of binary system 1,4-butanediol plus water at T = ( 293.15, 298.15, 303.15, 308.15, 313.15 and 318.15) K

Density and dynamic viscosity data were measured over the whole concentration range for the binary system 1,4-butanediol (1) + water (2) at T=(293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K as a function of composition under atmospheric pressure. Based on density and dynamic viscosity data, excess molar density ((E)), dynamic viscosity deviation () and excess molar volume (V-m(E)) were calculated. From the dynamic viscosity data, excess Gibbs energies (G*(E)), Gibbs free energy of activation of viscous flow (G*), enthalpy of activation for viscous flow (H*) and entropy of activation for viscous flow (S*) were also calculated. The (E), V-m(E), and G*(E) values were correlated by a Redlich-Kister-type function to obtain the coefficients and to estimate the standard deviations between the experimental and calculated quantities. Based on FTIR and UV spectral results, the intermolecular interaction of 1,4-butanediol with H2O was discussed.