Abstract

Variation of the viscosity as a function of temperature and composition in Cyanex 272–Cyphos IL 101 binary mixtures has been investigated between 288.15K and 343.15K in the whole range of mole fraction. Valuable information regarding intermolecular interactions between Cyanex 272 and Cyphos IL 101 has been deduced from viscosity data by calculating excess viscosities, activation enthalpies and entropies and ion contributions to the activation energy and the activation entropy for the viscous flow. Peculiarly Cyphos IL 101 and Cyanex 272 exist as contact ion-pairs and ion-pairs separated by hydrochloride molecule depending on the mole fraction of Cyphos IL 101 in the binary mixture.

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