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Synthesis and optimization of polyurethane microcapsules containing [BMIm]PF6 ionic liquid lubricant.
Yingjie Ma1, Zhike Li1, Huaiyuan Wang2
1Provincial Key Laboratory of Oil & Gas Chemical Technology, School of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China.
Journal of Colloid and Interface Science
|September 25, 2018
Summary
Polyurethane microcapsules containing [BMIm]PF6 ionic liquid were developed using Pickering emulsions stabilized by lignin. These microcapsules significantly reduce friction and wear when added to epoxy, showcasing their potential as advanced lubricants.
Area of Science:
- Materials Science
- Polymer Chemistry
- Tribology
Background:
- Ionic liquids, such as [BMIm]PF6, offer excellent lubricating properties.
- Developing stable microcapsules for effective lubricant delivery is crucial for advanced materials.
- Polyurethane (PU) microcapsules provide a robust matrix for encapsulating functional materials.
Purpose of the Study:
- To fabricate polyurethane microcapsules containing [BMIm]PF6 ionic liquid for lubrication applications.
- To investigate the emulsification effects of various stabilizers on [BMIm]PF6.
- To optimize the synthesis of [BMIm]PF6@PU microcapsules and evaluate their tribological performance.
Main Methods:
- Fabrication of PU microcapsules via interfacial polymerization.
- Utilizing Pickering emulsions stabilized by lignin for enhanced emulsification of viscous [BMIm]PF6.
- Optimizing monomer selection (IPDI, TETA), emulsifying rate, stabilizer concentration, and core-to-shell ratio.
Main Results:
- Lignin-stabilized Pickering emulsion demonstrated superior emulsification of [BMIm]PF6.
- Optimized [BMIm]PF6@PU microcapsules exhibited regular spherical morphology (43±15 µm diameter), compact structure, and high core content (>70%).
- Incorporation of 30 wt% microcapsules into epoxy reduced friction coefficient by 72.7% and wear rate by 160 times.
Conclusions:
- Lignin-based Pickering emulsions are effective for encapsulating viscous ionic liquids into PU microcapsules.
- The synthesized [BMIm]PF6@PU microcapsules possess desirable structural and thermal properties.
- These microcapsules significantly enhance the lubricating performance of epoxy composites.
Keywords:
Excellent thermal stabilityHigh core contentPickering emulsionPolyurethane microcapsules[BMIm]PF(6) lubricantMore Related Videos
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