Ultra-low Friction and High Load-Bearing Hydrogel with Tubular Structure Based on Controllable Light-Induced Dissociation  

作　　者：Song Yang Jianqing Yu Zhizhi Zhang Hao Yang Yaling Wan Bo Yu Shuanhong Ma Yanfei Ma Feng Zhou Weimin Liu 

机构地区：[1]School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an,Shaanxi,710072 China [2]Advanced Manufacturing College,Nanchang University,Nanchang,Jiangxi,330038 China [3]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou,Gansu,730030 China [4]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049 China

出　　处：《Chinese Journal of Chemistry》2023年第20期2679-2683,共5页中国化学（英文版）

基　　金：This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB 0470000);the National Natural Science Foundation of China(22032006,22072169 and 22102201);the National Key Research and Development Program of China(2021YFA0716304);the Key Research Project of Shandong Provincial Natural Science Foundation(ZR2021ZD27);the Gansu Province Basic Research Innovation Group Project(22JR5RA093);the Special Research Assistant Project of the Chinese Academy of Sciences。

摘　　要：With high water content,excellent biocompatibility and lubricating properties,and a microstructure similar to that of the extracellular matrix,hydrogel is becoming one of the most promising materials as a substitute for articular cartilage.However,it is a challenge for hydrogel materials to simultaneously satisfy high loading and low friction.Most hydrogels are brittle,with fracture energies of around 10 J·m^(-2),as compared with∼1000 J·m^(-2) for cartilage.A great deal of effort has been devoted to the synthesis of hydrogels with improved mechanical properties,such as increasing the compactness of the polymer network,introducing dynamic non-covalent bonds,and increasing the hydrophobicity of the polymer,all at the expense of the lubricating properties of the hydrogel.Herein,we develop a hydrogel material with anisotropic tubular structures where the compactness gradually decreases and eventually disappears from the surface to the subsurface,achieving a balance between lubrication and load-bearing.The porous layer with hydrophilic carboxyl groups on the surface exhibits extremely low friction(coefficient of friction(COF)∼0.003,1 N;COF∼0.08,20 N)against the hard steel ball,while the bottom layer acts as an excellent load-bearing function.What is more,the gradual transition of the tubular structures between the surface and the subsurface ensures the uniform distribution of friction stress between a lubricating and bearing layers,which endows the material with long-lasting and smooth friction properties.The extraordinary lubricious performance of the hydrogels with anisotropic tubular structure has potential applications in tissue engineering and medical devices.

关 键 词：Ultra-low friction HYDROGELS Anisotropic Hydroge Structure High load-bearing Biomimetic synthesis Microstructures 

分 类 号：O63[理学—高分子化学]