Abstract
We examined the rheological and tribological behavior of novel formulations based on castor oil and epoxidized cellulose pulp intended for use as biodegradable lubricating greases. Epoxidized cellulose pulp was found to thicken castor oil to a variable extent depending on its modification degree and the epoxide compound. Greases were subjected to small-amplitude oscillatory shear tests, evaluating the temperature-dependence of the plateau modulus. In addition, friction coefficient and wear were determined in a steel–steel ball-on-three-plates tribological configuration, at two different temperatures (25 and 95 °C), generally obtaining smaller values of both parameters when using aromatic diepoxides instead of aliphatic to modify the cellulose pulp.
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