Abstract
Ultralow friction polymer composites were prepared by adding oil-loaded microcapsules into epoxy (EP) resin. Mono-dispersed polystyrene (PS)/poly alpha olefin (PAO) microcapsules with a diameter of ~2 μm and a shell thickness of ~ 30 nm were prepared by solvent evaporation method in an oil-in-water emulsion. The lubrication behaviors of the EP resin composites with oil-loaded microcapsules have been investigated under different loads and sliding speeds. As compared with the pure EP resin, the friction coefficient of the composite could be reduced to 4% (from 0.71 to 0.028) and the wear rate could be decreased up to two orders of magnitude. It was demonstrated that the released PAO oil from the microcapsules during the friction process produced a boundary lubricating film, which could prevent the direct contact of two rubbing surfaces, and thus leading to an extremely low friction coefficient and wear rate. Moreover, the composites with microcapsules could achieve comparable lubrication properties to the case under the external lubrication condition, while the former case could effectively minimize the lubricant leakage and improve the lubrication efficiency.
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Acknowledgments
This work was supported by the National Natural Sdence Foundation of China (Grant Nos. 51822505, 51811530014, and 51605008) and Beijing Natural Sdence Foundation of China (Grant No. 3182010).
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Lin ZHANG. She received her Ph.D. degree at Beijing University of Chemical Technology, in 2017, majoring in chemical engineering and technology. She is currently a post-doctor at the State Key Laboratory of Tribology of Tsinghua University. Dr. Zhang has published 6 papers in international journals indexed by SCI. Her research interests include the self-lubricating polymer composites, self-healing materials, and core-shell materials, etc.
Guoxin XIE. He received his Ph.D. degree at Tsinghua University, China, in 2010, majoring in mechanical engineering. After that, he spent two years at State Key Laboratory of Tribology, Tsinghua University, China for postdoctoral research. From 2012 to 2014, he worked at Royal Institute of Technology, Sweden, for another two-year post-doctoral research. Since 2014, he has worked at Tsinghua University as an associate professor. His research interests include intelligent self-lubrication, electric contact lubrication, etc. He has published more than 50 referred papers in international journals. He won several important academic awards, such as Chinese Thousands of Young Talents, the Excellent Doctoral Dissertation Award of China, and Ragnar Holm Plaque from KTH, Sweden.
Jianbin LUO. He received his BEng degree from Northeastern University in 1982, and got his MEng degree from Xi’an University of Architecture and Technology in 1988. In 1994, he received his Ph.D. degree from Tsinghua University and then joined the faculty of Tsinghua University. Prof. Jianbin Luo is an academician of the Chinese Academy of Sciences and a Yangtze River Scholar Distinguished Professor of Tsinghua University, Beijing, China. He was awarded the STLE International Award (2013), the Chinese National Technology Progress Prize (2008), the Chinese National Natural Science Prize (2001), and the Chinese National Invention Prize (1996). Prof. Luo has been engaged in the research of thin film lubrication and tribology in nanomanufacturing. He has been invited as a keynote or plenary speaker for 20 times on the international conferences.
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Zhang, L., Xie, G., Wu, S. et al. Ultralow friction polymer composites incorporated with monodispersed oil microcapsules. Friction 9, 29–40 (2021). https://doi.org/10.1007/s40544-019-0312-4
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DOI: https://doi.org/10.1007/s40544-019-0312-4