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Cobaltocenium-Based Metallo-polyampholyte for Friction Reduction and Antiwear via Hydration Lubrication
Shida Hou1, Ping Peng1, Feiran Sun1
1Department of Chemistry, School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an710129, P. R. China.
ACS Applied Materials & Interfaces
|August 13, 2026
Summary
A novel cobaltocenium-based zwitterionic polymer (PGMA-Co+S-) significantly enhances water-based lubrication. This advanced additive reduces friction and wear, offering a sustainable solution for demanding conditions.
Area of Science:
- Materials Science
- Tribology
- Polymer Chemistry
Background:
- Water-based lubricants are eco-friendly but lack sufficient tribological performance.
- Conventional oil-based lubricants have limitations in cost, flammability, and environmental impact.
- Developing high-performance additives for water-based systems is crucial for broader applications.
Purpose of the Study:
- To introduce a cobaltocenium-based zwitterionic polymer (PGMA-Co+S-) as a superior additive for water-based lubricants.
- To evaluate the tribological performance of PGMA-Co+S- under various conditions.
- To elucidate the mechanism behind the enhanced lubrication properties.
Main Methods:
- Synthesized a cobaltocenium-based zwitterionic polymer (PGMA-Co+S-).
- Conducted tribological tests comparing PGMA-Co+S- in water against pure water.
- Assessed performance under high load, high frequency, extended duration, and saline environments.
Main Results:
- PGMA-Co+S- reduced the coefficient of friction by up to 51% (0.343 to 0.167).
- Wear volume decreased by up to 72% (5.85 × 104 to 1.65 × 104 μm3).
- Consistent performance was observed under severe operating conditions, including salinity.
Conclusions:
- The cobaltocenium-based zwitterionic polymer demonstrates exceptional lubrication and antiwear capabilities in water.
- Synergistic effects of cobaltocenium and sulfonate groups create a durable, protective lubricating film.
- PGMA-Co+S- offers a promising, sustainable solution for high-efficiency water-based lubrication in challenging environments.
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