NOVEL THERMODYNAMIC PROPERTIES OF BINARY MIXTURES OF TETRAHYDROFURFURYL ALCOHOL WITH SOME ALCOHOLS AT 298.15 K

To understand the nature of molecular aggregation between two solvents, excess properties (e.g. excess molar volume (V ), excess Gibb's free energy of activation viscous flow (∆G*E) and viscosity deviation of binary mixtures) are therefore needed. Thus, in the current study, the refractive index (nD), viscosity (η), and density (ρ) of binary mixtures were measured for tetrahydrofurfuryl alcohol (THFA) with ethanol, 2-propanol and 2-butanol at 298.15K. Moreover and based on experimentally obtained results, the V , the refractive index deviation (∆nD), excess molar viscosity (ηE) and ∆G*E were calculated. To correct and fit the experimental V , ηE and ∆nD deviations, Redlich-Kister equation was used. The molecular interaction in binary mixtures was found to explain the variability of physical properties with the composition of the mixtures. In light of obtained results, factors influencing the molecular interactions (e.g. the length of the carbon chain and the position of hydroxyl groups in targeted alcohol) have been also discussed. In all cases the obtained V , ηE, ∆G*E and ∆nD values were negative at 298.15K except for the binary system (THFA + 2butanol) where the results indicate the positive deviation in refractive indices.