Viscosimetric properties and internal structure of N,N-dimethylformamede+1,2-dimethoxyethane binary mixtures

The kinematic viscosities (v) of liquid binary mixtures of N,N-dimethylformamide and 1,2-dimethoxyethane were measured at 19 temperatures in the range -10 less than or equal to t / degreesC less than or equal to 80, employing the pure species and 9 their solutions covering the whole miscibility range expressed by the condition 0 less than or equal to x(i) less than or equal to 1. The measured values have been used to test some empirical equations of the type v=v(T), v=v(x(i)), and v=v(T,x(i)), in order to obtain useful correlation models with predictive ability in correspondence of the experimental data gaps. Starting from the experimental data, the excess kinematic viscosities (v(E)) have been calculated. Sign and magnitude of these quantities have been discussed in terms of type and nature of specific intermolecular interactions. Some derived quantities such as thermodynamic parameters of the viscous flow (DeltaG*, DeltaH* and DeltaS*), have been calculated on the basis of Eyring's model. Furthermore, the fluidity of this binary solvent system was analysed and interpreted following Hildebrand and modified-Hildebrand correlation models. (C) 2003 Elsevier Science B.V. All rights reserved.