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.
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This research was financially supported by the National Key R&D Program of China (2020YFB2006901), National Natural Science Foundation of China (51935006), CAS Project for Young Scientists in Basic Research (YSBR-023), Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2020417), and Key Research Program of the Chinese Academy of Sciences (XDPB24).
Tingmei WANG. She is currently a researcher and doctoral supervisor at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, China. She received her bachelor degree (1992) in Department of Organic Chemical Engineering, Northwest University and Ph.D. degree (2003) in Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Her current research interests focus on design and preparation of porous polymer composites, design and development of polymer composites, preparation and properties of organic/inorganic nanocomposites, and development of high strength fiber reinforced composites. She has published over 200 journal papers and gained a number of awards.
Chao WANG. He is currently a researcher and doctoral supervisor at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, China. He received his Ph.D. degree in Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. His current research interests focus on design and preparation of porous polymer composites, and design and development of smart lubrication material and polymer self-lubricating composites. He is a candidate for the talent project of “Light of West China” Program of Chinese Academy of Sciences, and Youth Innovation Promotion Association of Chinese Academy of Sciences.
Hongwei RUAN. He is a Ph.D. candidate in the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, University of Chinese Academy of Sciences. His research focuses on the porous oil-containing material and the development of smart lubrication material.
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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 11, 1014–1026 (2023). https://doi.org/10.1007/s40544-022-0642-5
- recyclable smart lubrication
- hierarchical pore structure
- oil-content and oil-retention
- friction and wear