Viscosity of Isomeric Octyl Alcohols as a Function of Temperature and Pressure

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Abstract
The viscosity of 2‐ and 3‐octanol and 6‐methyl‐3, 5‐methyl‐3‐, and 2‐methyl‐3‐heptanol has been measured as a function of temperature (−20°–80°C) and pressure (0–4 kbar). Specific structural differences exist in the temperature and pressure coefficients of isobaric viscosity; these differences are minimized, but still exist, when isochoric viscosities are compared. Viscous flow and dielectric relaxation of these liquids are compared, and it is concluded that the rate‐determining steps are dissimilar. A previously proposed pressure‐induced liquid structure transformation in these liquids could not be verified viscometrically.