Excess Viscosities of Binary Mixtures of γ-Butyrolactone With Isoalcohols

Abstract

Densities and viscosities of binary liquid mixtures of γ-butyrolactone as common component with isopropanol, isobutanol and isopentanol as non-common components were determined over the entire mole fraction range at 303.15 K. The values of η^E are negative over the entire composition range. Further, the study has been extended to evaluate interaction parameter, d. The values of both η^E and d indicate the existence of dispersion forces between unlike molecules; intermolecular interactions between unlike molecules are explained in terms of excess Gibbs free energy for activation of flow (G^E), and interaction energy (W_visc).