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Polymer Brush-Functionalized MoS₂ as a Water-Based Lubricant Additive.

Haohao Ren¹, Huayi Zeng², Chufeng Sun¹

¹Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Gansu Provincial Biomass Function Composites Engineering Research Center, Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province, Gansu Province Research Center for Basic Sciences of Surface and Interface Chemistry, College of Chemical Engineering, Northwest Minzu University, Lanzhou, 730124, China.

Macromolecular Rapid Communications

|December 23, 2024

Summary

Researchers developed a novel water-based lubricant additive using functionalized molybdenum disulfide (MoS2) nanoparticles. This enhanced additive improves dispersion and reduces friction, offering a promising solution for advanced water-based lubrication applications.

Keywords:

MoS2 dispersibility polymer brushes tribological property water‐based lubricant additive

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Area of Science:

Materials Science
Tribology
Nanotechnology

Background:

Water-based lubricants offer cost-effectiveness and environmental benefits but suffer from poor tribological performance.
Molybdenum disulfide (MoS2) is a known tribological material but exhibits poor dispersion in aqueous environments.

Purpose of the Study:

To enhance the dispersion and tribological properties of molybdenum disulfide (MoS2) for water-based lubrication.
To develop a novel water-based lubricant additive using functionalized MoS2 nanoparticles.

Main Methods:

Grafting poly(3-sulfopropyl methacrylate potassium salt) (PSPMA) onto MoS2 nanoparticles via ultraviolet-initiated polymerization.
Evaluating the dispersion stability of the modified MoS2 (MoS2+PSPMA) in water.
Assessing the tribological performance of MoS2+PSPMA as a water-based lubricant additive under reciprocating friction.

Main Results:

MoS2+PSPMA demonstrated significantly improved dispersion stability in water compared to unmodified MoS2.
The functionalized MoS2 additive effectively reduced friction and wear by forming a protective film on surfaces.
MoS2+PSPMA exhibited excellent dispersion and a low friction coefficient in water.

Conclusions:

Functionalizing MoS2 with PSPMA via UV-grafting is an effective strategy to improve its water dispersibility.
MoS2+PSPMA shows significant potential as a high-performance additive for eco-friendly water-based lubricants.
This development paves the way for more efficient and sustainable lubrication solutions.