(352j) Viscosities of Binary Mixtures of Dimethyl Carbonate with C6-C7 Alcohols at T = (288.15 – 308.15) K

Dimethyl carbonate (C₃H₆O₃) is a dimethyl ester and it is a colorless liquid that is sparingly soluble in water, but miscible in polar organic solvents. It is used as substitute of hazardous chemicals compounds. The alcohols studied are soluble in a variety of common organic solvents. In the present work, kinematic viscosities and densities were measured over the whole concentration range for the binary liquid mixtures of dimethyl carbonate with 1-hexanol and 1-heptanol, at different temperatures T = (288.15 – 308.15) K under atmospheric pressure. These values have been used to calculate the deviation in viscosity and excess Gibbs energy of activation for viscous flow and to investigate the DMC in a family of six alcohols interaction. These excess properties are fitted to the Redlich-Kister polynomial equation and were in good agreement with the experimental values. The viscosities and densities of pure components and their solutions were measured using a rotational viscometer/densimeter manufactured by Anton Paar (Model Stabinger SVM 3000). In addition, viscosity results were fitted to the equations of Grünberg-Nissan, Hind et. al., Heric-Brewer, Van der Wyk and Katti-Chaudhri. For all systems studied, the values of deviation in viscosity and excess Gibbs energy of activation of viscous flow were negative over the entire composition range. The results obtained were discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules.