Thermodynamics of solvent mixtures. I. Density and viscosity of binary mixtures of <i>N</i>-methylpyrrolidinone – tetrahydrofuran and propylene carbonate – acetonitrile

Abstract

Excess volumes and viscosities of binary liquid mixtures of N-methylpyrrolidinone – tetrahydrofuran and propylene carbonate – acetonitrile are measured and examined in the light of empirical theories such as absolute rate, free volume, and regular solution theories. It is shown that non-ideality arises due to (a) shape factors, (b) molecular interaction, and that the two properties, excess volume and viscosity, illustrate these two aspects of non-ideality.