VISCOSITIES OF N-ALKYLAMINES FROM 15-DEGREES-C TO 80-DEGREES-C

The viscosities of seven n-alkylamines from n-butylamine to n-decylami ne were determined from 15 to 80 degrees C at 5 degrees C intervals. T he intrinsic volumes were determined by extrapolation of the plot of f luidity against molar volume to zero fluidity and found to be a linear function of the number of carbon atom?;. Plots of the logarithm of vi scosity vs. reciprocal absolute temperature were almost linear. The en ergies of activation for viscous flow for the n-alkylamines were calcu lated and found To increase with increase in the carbon number. The B values, based on Hildebrand's equation and representing a measure of a molecules resistance To transport of momentum, were calculated for ea ch of the n-alkylamines. A modified form of the equation describing th e change fluidity with temperature was then formulated. It is suggeste d that the activation energy for viscous flow consists of the sum of t he energy required for the expansion of the void volume and the energy required to overcame intermolecular interactions. These energies were calculated and discussed.