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. 2018 Feb 28;23(3):537. doi: 10.3390/molecules23030537

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Friction coefficient while lubricating by EG/lignin lubricants. Load: 2.5 GPa, testing duration: 1 h, temperature: 25 °C. (a): EG; (b): EG-17BL; (c): EG-17SL; (d): EG-29BL; (e): EG-29SL; (f): EG-38BL; (g): EG-38SL; (h): EG-44BL; (i): EG-44SL; (j): EG-50BL, (k): EG-50SL. The value in the figure is the average friction coefficient of three friction tests.