Study on molecular interactions by antagonism, synergy and excess functions of ternary mixtures of tetrahydrofuran with dimethylsulphoxide and monoalkanols

摘要

The densities and viscosities of eight ternary mixtures of tetrahydrofuran, dimethylsulphoxide and monoalkanols: methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, amyl alcohol and i-amyl alcohol are determined over the entire range of composition at 298.15 K. From the experimental measurements, excess molar volumes (V~E), viscosity deviation (δη), antagonism and antagonic index (I_A) are derived by the equations developed by Kalentunc-Gencer, Peleg and Howell, respectively. A power factor, F_(eta;), has also been introduced here. Also, the speeds of sound of these ternary mixtures have been measured over the whole composition range at the same temperature and thus, the isentropic compressibility (K~E_S) and excess isentropic compressibility (K~S) have been evaluated from the experimental data. The results are discussed in terms of molecular packing, specific interactions and nature of liquid mixtures. The systems studied here exhibit very strong cross association through hydrogen bonding.