Abstract
The temperature dependence of a fluid's shear viscosity is critical in determining its suitability as a liquid lubricant over an extended temperature range. We have applied van Krevelen's equations to a series of ten linear and branched perfluropolyalkylethers (PFPAEs) to predict viscosity-temperature. Calculated viscosities were a factor of ten or more greater than experiment at all temperatures, indicating that these “universal” equations are inadequate for these atypical fluids. Therefore, new semi-empirical viscosity equations have been derived and parameterized specifically for PFPAEs utilizing recent data. The new equations predict values within a factor of two of experimental viscosities in almost all systems, and hence should be useful in the molecular design of new PFPAE fluids for high temperature lubricants.
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