The scope of this study is to elucidate the physical mechanisms influencing thetransient flow behavior of lubricating greases based on biogenic oleochemicals from apolarity point of view. This includes the mutually interacting influence of base oil polarityand thickening agents on the rheologically-measured mechanical structural degradation intransient shear flow. Due to the high temperature dependence of Keesom forces in thebackground of polar-active bond mechanisms, the analysis of the transient flow response asa function of temperature allows to attribute the observed influences to differences in baseoil polarity. In general, clay-thickened greases show a greater tendency to be rheologicallyinfluenced by base oil polarities than soap-thickened lubricating greases.
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