基于纤维增强和磁场诱导构建坚韧、抗疲劳各向异性水凝胶及其性能研究  

Tough and fatigue-resistant anisotropic hydrogels via fiber reinforcement and magnetic field induction

作　　者：陈琴 陈凯 武盟 张欣悦 冯海燕 冯存傲 王大刚 李晓伟 张德坤 曾宏波 Qin Chen;Kai Chen;Meng Wu;Xinyue Zhang;Haiyan Feng;Cunao Feng;Dagang Wang;Xiaowei Li;Dekun Zhang;Hongbo Zeng(School of Chemical Engineering and Technology,School of Materials Science and Physics,School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China;Department of Chemical and Materials Engineering,University of Alberta,Edmonton,Alberta T6G 1H9,Canada)

机构地区：[1]School of Chemical Engineering and Technology,School of Materials Science and Physics,School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China [4]Department of Chemical and Materials Engineering,University of Alberta,Edmonton,Alberta T6G 1H9,Canada

出　　处：《Science China Materials》2023年第12期4841-4852,共12页中国科学（材料科学）（英文版）

基　　金：financially supported by the Natural Science Foundation of Jiangsu Province(BK20211243);Jiangsu Provincial Key Research and Development Program(BE2022708);the Tribology Science Fund of State Key Laboratory of Tribology in Advanced Equipment(SKLTKF21B15);the Open Fund of State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics(LSL-2107).

摘　　要：生物组织(如肌腱、软骨等)不仅具有优异的强度、模量和韧性,而且具有长期稳定性,可承受数百万次高应力循环而不断裂,其疲劳阈值超过1000 J m^(−2).相比之下,尽管合成水凝胶在强度、模量、韧性和其他性能方面与天然软组织相当,但这些增韧水凝胶仍然会在反复循环载荷下遭受疲劳断裂,其疲劳阈值通常低于100 J m^(−2).在本工作中,我们报道了一种简单的策略,用于开发韧性和抗疲劳的各向异性水凝胶,其疲劳阈值超过常规水凝胶的100倍.各向异性水凝胶通过两步工艺合成,包括磁场定向工艺形成优先排列的PDA-Fe_(3)O_(4)-CF纤维结构,以及冷冻解冻-退火工艺处理.优先排列纤维结构和高结晶度的协同作用使各向异性水凝胶具有超高的强度和韧性、优异的摩擦学性能和非凡的抗疲劳性能.各向异性水凝胶的抗拉强度、抗压强度和疲劳阈值分别高达11.82±0.85 MPa、5.95±0.35 MPa和1845 J m^(−2),显著高于大多数生物凝胶和合成水凝胶.因此,本研究为制造性能优异的软材料提供了一种可行的方法,拓展了软质材料在承重材料(如人工软组织)、软机器人、柔性电子等领域的应用.Biological tissues(such as tendons and cartilages)are not only well known for their excellent strength,modulus,and toughness,but also have long-term stability which can withstand millions of high-stress cycles without fracture,and show a fatigue threshold of more than 1000 J m^(−2).In contrast,although synthetic hydrogels are comparable to natural soft tissues in terms of strength,modulus,toughness,and other properties,these toughened gels will still be subjected to fatigue fracture under repeated cyclic loading,exhibiting a fatigue threshold usually below 100 J m^(−2).Here,we report a simple strategy for the development of tough and fatigue-resistant anisotropic hydrogels with a fatigue threshold more than 100 times that of conventional hydrogels.Our two-step process mainly includes the formation of an arranged polydopamine-Fe_(3)O_(4)-carbon fiber structure,followed by freezing-thawing and annealing,synergistically contributing to the ultrahigh strength and toughness,excellent tribological properties,and extraordinary fatigue resistance.The tensile strength,compressive strength,and fatigue threshold of the anisotropic hydrogel were up to 11.82±0.85 MPa,5.95±0.35 MPa,and 1845 J m^(−2),respectively,which were significantly higher than those of most biogels and synthetic hydrogels.Therefore,this research provides a feasible method for manufacturing soft materials with excellent properties and expands the application of soft materials in load-bearing materials,soft robots,flexible electronics,etc.

关 键 词：anisotropic hydrogels PDA-Fe_(3)O_(4)-CF fatigueresistant magnetic field induction 

分 类 号：TQ427.26[化学工程]