Effect of hydrogen bonding on the viscosity of alcohols at high pressures

Viscosities of several alcohols and vinyl acetate were measured with a rollingball viscometer. The viscosity meast, rements were performed at temperatures from 298 to 413 K and pressures up to 195 MPa with an accuracy of ___2% . The viscosities of tile alcohols show a stronger dependence on temperature compared with that of substances that do qot form hydrogen bonds. In addition, the secondary and tertiary alcohols show a viscosity temperature dependence not in accordance with an Arrhenius law. An effect of pressure on the association of alcohol molecules resulting from hydrogen bonding was not resolved by means of viscosity data. Separation of the efl~ct of association size upon increasing temperature from the viscosity caused by the change of specific volume was carried out using the Utracki free volume model.