Excess volumes and viscosities of N-methyl-2-pyrrolidinone with branched alcohols at 298.15 K

Abstract

Excess volumes (<i>V</i>_m^E) and viscosities (η) of binary liquid mixtures of N-methyl-2-pyrrolidinone with branched alcohols have been measured as a function of composition at 298. 15 K. The branched alcohol includes 2-propanol, 2-methyl- 1 -propanol, 3-methyl- 1 -butanol, and 2-methyl-2-propanol. The <i>V</i>_m^E for each of the mixtures studied are negative over the whole composition range. From the experimental data, the deviation in viscosities (Δη) and excess energies of activation (Δ<i>G</i>^*E) for viscous flow have been calculated. These values are negative over the entire range of composition. The results for <i>V</i>_m^E, Δη, and to Δ<i>G</i>^*E are discussed in terms of interaction between components. The viscosity data have been correlated with the equations of McAllister, Heric, and Auslaender.