On the Viscosity of Nonpolar Liquids

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Abstract
The phenomenon of viscosity drop by flow‐orientation (i.e., mechanical orientation in a Couette apparatus) with nonpolar liquids composed of large dissymmetrical molecules points to a marked influence of the dissymmetry of polarizability on this phenomenon and on viscosity in general. In the case of such liquids the molecular forces of interaction are practically confined to the dispersion forces, and there are very definite states of minimum mutual potential energy. This condition results in temporary formation of complexes of higher saturation of those residual fields of force which interact in the phenomenon of viscosity. An analogous case is represented by long chain hydrocarbon molecules with polar head where the dipole forces are eliminated to a great extent, insofar as viscosity is concerned, by association, resulting in a viscosity behavior very similar to that of corresponding paraffins. With small molecules, even small permanent moments tend to suppress the influence of the anisotropy of polarizability of deformation, resulting in a type of complex which is ultimately, even temporarily, more determined by the dipole forces.

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