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Pyrylium- and Pyridinium-Based Ionic Liquids as Friction Modifiers for Greases
Miguel A Chacon-Teran1, Cinderella Moustafa2, Joanne Luu1
1Department of Chemistry and Biochemistry, University of California, Merced, California 95343, United States.
ACS Applied Materials & Interfaces
|March 1, 2024
Summary
New ionic liquids (ILs) reduced friction in greases but increased wear. Researchers explored pyrylium- and pyridinium-based ILs as lubricant additives, finding molecular structure influenced performance.
Area of Science:
- Materials Science
- Tribology
- Organic Chemistry
Background:
- Ionic liquids (ILs) are increasingly studied as lubricant additives.
- Previous research focused on phosphonium- and imidazolium-based ILs.
- Limited exploration of other IL structures for lubrication.
Purpose of the Study:
- Synthesize and evaluate novel pyrylium- and pyridinium-based ionic liquids (ILs).
- Investigate their performance as friction- and wear-reducing additives in naphthenic greases.
- Analyze the influence of IL molecular structure on tribological properties.
Main Methods:
- Preparation of new pyrylium- and pyridinium-based ionic liquids with long alkyl chains.
- Measurement of physical properties of synthesized ILs and additized naphthenic greases.
- Tribological testing using standard benchtop methods to assess friction and wear.
Main Results:
- Ionic liquid additives improved friction performance under most tested conditions.
- Wear performance was negatively impacted, with increased material removal in most cases.
- Compatibility and miscibility of ILs with naphthenic grease were observed.
Conclusions:
- Pyrylium- and pyridinium-based ILs show potential for friction reduction in greases.
- The molecular structure of ILs plays a crucial role in their tribological behavior.
- Further research is needed to optimize ILs for improved wear resistance.
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