Temperature Dependence of Viscosities of Short and Long Chain Organic Compounds (Carboxylic Acids)

摘要

Relative viscosities for formic, acetic, propionic and butyric acids in ethanol were determined using a thermo-stated ubbelohde flow viscometer in the temperature range of 20 C to 50 C. From the experimental results, excess viscosities, excess volumes and flow activation energies were calculated using Arrhennius type and Eyring type equations. Free energy of activation, activation entropy and activation enthalpies were also evaluated. Explanations of quantities in terms of acid-acid, acid-ethanol and ethanol-ethanol interactions have been given with special emphasis on hydrogen bonding.