1. Influence of Base Oil Polarity on the Transient Shear Flow of Biodegradable Lubricating Greases
- Author
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José M. Franco, Rubén Sánchez, Claudia S. Leopold, Concepción Valencia, Berliner Tor, Erik Kuhn, and Martin Fiedler
- Subjects
Materials science ,Petroleum engineering ,Biodegradable lubricating greases ,Polarity (physics) ,Mechanical Engineering ,Base oil ,Structural degradation ,biodegradable lubricating greases ,Oil polarity ,Surfaces, Coatings and Films ,Transient flow ,Rheology ,oil polarity ,lcsh:Q ,rheology ,transient flow ,Transient (oscillation) ,Thickening ,AFM ,Composite material ,lcsh:Science ,Shear flow - Abstract
The scope of this study is to elucidate the physical mechanisms influencing the transient flow behavior of lubricating greases based on biogenic oleochemicals from a polarity point of view. This includes the mutually interacting influence of base oil polarity and thickening agents on the rheologically-measured mechanical structural degradation in transient shear flow. Due to the high temperature dependence of Keesom forces in the background of polar-active bond mechanisms, the analysis of the transient flow response as a function of temperature allows to attribute the observed influences to differences in base oil polarity. In general, clay-thickened greases show a greater tendency to be rheologically influenced by base oil polarities than soap-thickened lubricating greases.
- Published
- 2015
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