Density and viscosity study of binary mixtures of eucalyptol with methanol, ethanol, 1-propanol, 1-butanol and 2-methylpropan-l-ol at 303.15, 308.15 and 313.15 K

Department of Chemistry, Hemchandracharya North Gujarat University, Patan-384 265, Gujarat, India

E-mail : smridhee2000@yahoo.co.in

Manuscript received 19 April 2007, revised 19 December 2008, accepted 19 December 2008

Density and viscosity of the binary liquid mixtures of eucalyptol with methanol, ethanol, 1-propanol, 1-butanol and 2-methylpropan-1-ol have been measured at 303.15, 308.15 and 313.15 K. From density and viscosity data, the values of excess molar volume (V_m^E), the excess viscosity (η^E) and the excess Gibb's free energy of activation of flow (∆G^#E) have been determined. The computed results have been fitted to Redlich-Kister polynomial equation. Further, the density and viscosity data have been theoretically analysed for the validity of several viscosity models. The main thrust of the study is to correlate the excess properties and the relevant interaction parameters with the nature of molecular interactions between the mixing components. Deviations from ideal behavior are discussed from the point of view of molecular interactions present between the unlike molecules. The strength of interaction is related to alkyl chain length of alcohols. The results are discussed In terms of the interaction parameters obtained from Grunberg-Nissan, Tamura-Kurata and Hind viscosity models and excess properties.