Excess molar volumes and viscosities for binary liquid mixtures containing polyethers and pyrrolidin-2-one at 298.15 K

Abstract

Excess molar volumes and viscosities have been measured as a function of mole fraction at 298.15 K and atmospheric pressure for binary mixtures of polyethers + pyrrolidin-2-one. The polyethers are ethylene glycol dimethyl ether (monoglyme), CH₃(OC₂H₄)OCH₃, diethylene glycol dimethyl ether (diglyme), CH₃(OC₂H₄)OCH₃, triethylene glycol dimethylether (triglyme), CH₃(OC₂H₄)OCH₃, and tetraethylene glycol dimethyl ether (tetraglyme), CH₃(OC₂H₄)OCH₃. In all mixtures, the excess molar volumes are negative over the whole mole fraction range. The minimum values of excess molar volumes decrease in the order: triglyme > tetraglyme > diglyme > monoglyme. From the experimental data, deviations in the viscosity have been calculated. The results are discussed in terms of dipole-dipole interactions between glyme and pyrrolidin-2-one. These interactions are more important in the case of lower glymes.