Thermodynamic and FT-IR study on molecular interactions between ethyl lactate with alkyl amines at different temperatures

ABSTRACTDensities (ρ) and speeds of sound () were measured for the binary mixtures formed by ethyl lactate with n-propylamine, diisopropylamine, dipropylamine and tripropylamine mixtures at temperatures (303.15, 308.15 and 313.15) K over the entire composition range. These data were used to compute the isentropic compressibilities (), intermolecular free lengths (), excess molar volume (), excess isentropic compressibility (), excess inter molecular free lengths () and excess speeds of sound (). The excess functions were fitted and correlated with Redlich–Kister equation. The measured data were discussed in terms of intermolecular interactions between component molecules. The values in the investigated mixtures were compared with various theoretical models to check their relative merits of pure component properties. FT-IR studies have been carried out and analysed to study the presence of interactions between unlike molecules of these mixtures. A good agreement is observed among the excess parameters and ...