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Open AccessArticle

Influence of Base Oil Polarity on the Transient Shear Flow of Biodegradable Lubricating Greases

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Fuchs Schmierstoffe GmbH, Friesenheimer Straße 19, 68169 Mannheim, Germany
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Complex Fluid Engineering Laboratory, Department of Chemical Engineering, Faculty of Experimental Sciences, University of Huelva, Huelva 21071, Spain
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Pharmaceutical Technology, Institute of Pharmacy, University of Hamburg, Bundesstr 45, Hamburg 20146, Germany
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Laboratory of Machine Elements and Tribology, Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences, Berliner Tor 5, Hamburg 20099, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: James Krzanowski
Lubricants 2015, 3(3), 611-627; https://doi.org/10.3390/lubricants3030611
Received: 1 July 2015 / Accepted: 31 August 2015 / Published: 9 September 2015
(This article belongs to the Special Issue Lubricating Greases)
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. View Full-Text
Keywords: biodegradable lubricating greases; AFM; oil polarity; rheology; transient flow biodegradable lubricating greases; AFM; oil polarity; rheology; transient flow
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Fiedler, M.; Sánchez, R.; Valencia, C.; Leopold, C.S.; Kuhn, E.; Franco, J.M. Influence of Base Oil Polarity on the Transient Shear Flow of Biodegradable Lubricating Greases. Lubricants 2015, 3, 611-627.

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