Journal
TRIBOLOGY INTERNATIONAL
Volume 167, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107421
Keywords
Water-based lubricant additives; Zwitterion polymer; Porous carbon nanosheets; Friction reduction
Categories
Funding
- National Key Research and Development Program of China [2018YFB0703802]
- NSFC [51972272]
- Natural Science Foundation of Shaanxi Province [2020JM-090]
- Fundamental Research Funds for the Central Universities of China
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The PEIS-PCNS, prepared by modifying N@PCNS with a zwitterionic polymer, showed exceptional tribological performance due to the synergistic lubrication effects and the formation of a protective carbon film. The hydration layer encapsulated by the zwitterionic polymer also contributed to the reduction of friction.
The zwitterion polymer functionalized N-enriched porous carbon nanosheets were prepared via pyrolysis and etching of pyridine-coordinated polymer for N@PCNS. Subsequently, N@PCNS was modified with polydopamine to grow the zwitterionic polymer (PEIS), thereby acquiring PEIS functionalized N@PCNS (PEIS-PCNS). The exceptional tribological performance of PEIS-PCNS was attributed to the synergistic lubrication effects of N@PCNS along with the zwitterionic polymer PEIS, which facilitates the formation of a stable protective carbon film over the worn surface via complicated tribo-chemical reaction. Meanwhile, the presence of a hydration layer encapsulated by PEIS as the boundary lubricating film proves highly conducive for friction reduction. The average coefficient of friction showed a dramatic decrease to 0.17 from 0.63, and the wear depth of stainless steel dropped 64%.
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