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Friction

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Ultralow friction polymer composites incorporated with monodispersed oil microcapsules

  • Lin Zhang
  • Guoxin XieEmail author
  • Shuai Wu
  • Shiguang Peng
  • Xiaoqing Zhang
  • Dan Guo
  • Shizhu Wen
  • Jianbin LuoEmail author
Open Access
Research Article
  • 41 Downloads

Abstract

Ultralow friction polymer composites were prepared by adding oil-loaded microcapsules into epoxy (EP) resin. Mono-dispersed polystyrene (PS)/poly alpha olefin (PAO) microcapsules with a diameter of ~2 μm and a shell thickness of ~ 30 nm were prepared by solvent evaporation method in an oil-in-water emulsion. The lubrication behaviors of the EP resin composites with oil-loaded microcapsules have been investigated under different loads and sliding speeds. As compared with the pure EP resin, the friction coefficient of the composite could be reduced to 4% (from 0.71 to 0.028) and the wear rate could be decreased up to two orders of magnitude. It was demonstrated that the released PAO oil from the microcapsules during the friction process produced a boundary lubricating film, which could prevent the direct contact of two rubbing surfaces, and thus leading to an extremely low friction coefficient and wear rate. Moreover, the composites with microcapsules could achieve comparable lubrication properties to the case under the external lubrication condition, while the former case could effectively minimize the lubricant leakage and improve the lubrication efficiency.

Keywords

polymer composite microcapsules solvent evaporation ultralow friction boundary lubrication 

Notes

Acknowledgments

This work was supported by the National Natural Sdence Foundation of China (Grant Nos. 51822505, 51811530014, and 51605008) and Beijing Natural Sdence Foundation of China (Grant No. 3182010).

Supplementary material

40544_2019_312_MOESM1_ESM.pdf (851 kb)
Ultralow friction polymer composites incorporated with monodispersed oil microcapsules

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Authors and Affiliations

  • Lin Zhang
    • 1
  • Guoxin Xie
    • 1
    Email author
  • Shuai Wu
    • 1
  • Shiguang Peng
    • 1
  • Xiaoqing Zhang
    • 2
  • Dan Guo
    • 1
  • Shizhu Wen
    • 1
  • Jianbin Luo
    • 1
    Email author
  1. 1.State Key Laboratory of Tribology, Department of Mechanical EngineeringTsinghua UniversityBeijingChina
  2. 2.School of Materials Science and Mechanical EngineeringBeijing Technology and Business UniversityBeijingChina

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