Organohydrogels with High-Speed Lubrication by Confining Polymer Chain Mobility by an Interpenetrated Heteronetwork |
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Authors: | Yunfei Ru Dr Yingchao Yang Qingshan Wu Dr Ruochen Fang Prof Tianyi Zhao Prof Jacob Klein Prof Mingjie Liu |
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Institution: | 1. Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, 100191 Beijing, P. R. China;2. Research Institute for Frontier Science, Beihang University, 100191 Beijing, P. R. China;3. International Research Institute for Multidisciplinary Science, Beihang University, 100191 Beijing, P. R. China
Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 76100 Rehovot, Israel |
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Abstract: | Hydrogels with pure hydrophilic network have received much attention due to their excellent low frictional behavior. However, the lubrication performance of hydrogels is not satisfied under high-speed condition due to the energy dissipation caused by adsorbed polymer chains as well as the failure of lubricating mechanisms accompanied by the transition of lubrication regime. In this work, interpenetrating double-network organohydrogels were constructed by combining hydrophilic and oleophilic polymer networks to modify the physiochemical properties of surface polymer chains, especially the chain mobility. The oleophilic polymer network spatially restricting the mobility of the swollen hydrophilic network in water, resulted in a low coefficient of friction (ca. 0.01) compared with conventional hydrogels at high speed (0.1 m s−1). Meanwhile, the organohydrogels had superior wear resistance, with almost no wear observed on the sliding track after 5 k cycles of rubbing at high speed. The design concept of organohydrogels can be extended to a variety of low-wear, highly-lubricating materials. |
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Keywords: | Chain Mobility Lubrication Organohydrogel Spatial Confinement |
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