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Research Article | Open Access

Efficacy of hierarchical pore structure in enhancing the tribological and recyclable smart lubrication performance of porous polyimide

Hongwei RUAN1,2, Yaoming ZHANG1, Fuzhi SONG1, Qihua WANG1,2, Chao WANG1( ), Tingmei WANG1,2( )
Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

Herein, a porous oil-containing material with hierarchical pore structure was successfully prepared through microtexturing large pores on the surface of porous polyimide (PPI) with single-level small pores. Compared to the conventional oil-containing material, the hierarchically porous oil-containing material exhibited high oil-content, and retained excellent mechanical properties and high oil-retention because of the synergistic effects of large pores and small pores. Furthermore, the lubricant stored in the hierarchically porous polyimide could release to the interface under thermal-and-mechano-stimuli, and the released lubricant could be reabsorbed into the hierarchically porous polyimide via the capillary-force offered by the porous channel. Based on the high oil-content and recyclable oil release/reabsorption, the hierarchically porous oil-containing polyimide exhibited excellent lubrication performance (coefficient of friction was 0.057). Furthermore, the composite could perform 1,069 cycles of smart lubrication (1 h per cycle), which significantly extended the service life of the hierarchically porous oil-containing smart lubrication material.

Keywords

recyclable smart lubricationhierarchical pore structureoil-content and oil-retentionfriction and wear

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Friction
Volume 11 Issue 6,
June 2023
Pages 1014-1026
DOI: 10.1007/s40544-022-0642-5
Cite this article:
RUAN H, ZHANG Y, SONG F, et al. Efficacy of hierarchical pore structure in enhancing the tribological and recyclable smart lubrication performance of porous polyimide. Friction, 2023, 11(6): 1014-1026. https://doi.org/10.1007/s40544-022-0642-5

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Received: 10 November 2021
Revised: 26 January 2022
Accepted: 25 April 2022
Published: 30 July 2022
© The author(s) 2022.

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