Hydrodynamic behavior of short chain molecules. II. Limiting viscosity number of n-alkanes

Abstract

Limiting viscosity numbers, [η], have been determined for the n‐alkanes (C₅ to C₄₀), in two solvents (benzene and carbon tetrachloride), at several temperatures (20–50 °C). The experimental [η]’s are corrected for the effect of the nonzero hydrodynamic volume of the solvent molecules. The corrected [η]’s are used to calculate the variation of the Flory–Fox constant with chain length. The results indicate that the nondraining limit has not been reached with these alkanes. Existing hydrodynamic theories of short chain molecules are compared with these experimental results. Agreement between theory and experiment is found only in the case of the extended Rouse–Zimm formalism of Paper I.