环氧树脂-水凝胶软硬复合表界面各向异性摩擦研究  

Anisotropic Friction of Epoxy-Bydrogel Based Surfaces with Soft-Hard Combination

作　　者：熊健 王彦斌[1] 吕阳 姬忠莹 张晓慧[4] 王晓龙 李志强[4] XIONG Jian;WANG Yanbin;LYU Yang;JI Zhongying;ZHANG Xiaohui;WANG Xiaolong;LI Zhiqiang(School of Chemical Engineering,Northwest Minzu University,Gansu Lanzhou 730030,China;Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai,Shandong Yantai 264006,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Key Laboratory of Stomatology of State Ethnic Affairs Commission,Northwest Minzu University,Gansu Lanzhou 730030,China)

机构地区：[1]西北民族大学化工学院,甘肃兰州730030 [2]烟台先进材料与绿色制造山东省实验室,山东烟台264006 [3]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [4]西北民族大学口腔医学国家民委重点实验室,甘肃兰州730030

出　　处：《摩擦学学报（中英文）》2024年第3期335-344,共10页Tribology

基　　金：国家自然科学基金项目(52005484,52175201,22165025)资助。

摘　　要：由取向微结构引起的各向异性摩擦学是生物系统中最常见的引起摩擦形式之一.而研究表明,软硬复合的生物表界面在获取各向异性摩擦力时更具有优势.因此,本研究中以最典型的钩状倒刺微结构为研究对象,结合3D打印先进制造技术,通过在仿生取向微结构表界面原位复合低模量的水凝胶材料,获得环氧树脂-水凝胶软硬复合表界面.研究结果表明,水凝胶在Fe^(3+)溶液中的配位交联6 h时,其模量为3.6 MPa,相对于环氧树脂(模量为13.6 MPa)为软材料.在5 N载荷下,仿生表界面正方向摩擦力为1.64 N,反方向摩擦力为3.44 N,其各向异性摩擦力最大差值可达1.80 N.本研究中对软硬复合的生物表界面具有一定的理论指导意义,有望在智能摩擦调控和软体机器人等方面发挥一定的作用.Anisotropic friction caused by oriented microstructure is one of the most common causes in biological systems. Typical examples like the snake locomotion with the aid of highly ordered fiber-like microstructures in ventral body side, the wheat awns propel the seeds on and into the ground with the help of silicified hairs that cover the awns,and the tree frogs have excellent wet attachment and friction performance can freely and repeatedly climb on vertical surfaces or overhang with the help of hierarchical pillar arrays. It has been demonstrated that the biological surface of soft-hard combination exhibits the more advantages for obtaining the anisotropic friction force, especially for the combination of hard structure and soft substrate. Even though the research of anisotropic friction based on the surface microstructures has obtained significant progress, the complicated preparation method, the little-span of modulus variation, and the unobvious switching of friction force are still limited the development of this project. Therefore, the hook-like spines, as one of the most effective topographies from various plants and animals for generating anisotropic force, were employed in this study. Furthermore, take advantages of additive manufacturing with the merits of creating sophisticated, bespoke and low-cost materials/devices, the surface with hook-like spines was prepared by a digital light process(DLP) 3D printer. And the optical microscope images displayed the printed surface was covered with hook-like spines exhibiting the same orientation and morphology, which were necessary for exploring the anisotropic friction force. In addition, for mimicking the typical combination of soft-hard combination and obtaining the dynamic friction force, the low modulus hydrogel was grown in-situ on the bionic oriented microstructures. To further enhance the mechanical performances, the prepared epoxy-hydrogel samples were immersed in Fe^(3+) solution for a secondary crosslinking by ionic coordination. The results demonstrated

关 键 词：仿生表界面 水凝胶 取向微结构 各向异性摩擦力 软硬复合 

分 类 号：TH117.1[机械工程—机械设计及理论]