末端膨大两级结构的制备及粘附性能测试  

Fabrication and Adhesion Test of the Secondary Structure with Large End

作　　者：吴连伟[1,2] 张昊[2] 李佳波[2,3] 郭东杰[2] 戴振东[2] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]南京航空航天大学仿生结构与材料防护研究所,江苏南京210016 [3]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《机器人》2011年第2期222-228,共7页Robot

基　　金：国家自然科学基金重点资助项目(60535020);国家自然科学基金资助项目(50805076);固体润滑国家重点实验室开放基金资助项目.

摘　　要：通过真空模具浇注法制备出硅橡胶基和聚氨酯基微米级粘附阵列一级结构,然后在其末端覆盖一层硅橡胶粘附层,从而形成粘附阵列二级结构.利用微摩擦试验机(UMT)测试了粘附阵列的切向粘附性能,结果表明:末端膨大结构增大了有效接触面积,提高了切向粘附性能;短距离的滑移可适当增加切向力,但随着滑移距离加大,切向力随之下降,最终趋于稳定;在滑移距离为1 mm时产生最大的切向粘附力;粘附阵列的粘附力随法向载荷增加而增大,当法向载荷超过一定值后,切向力逐渐减小,加载15mN的法向预载力产生最大的切向粘附力84.668 mN;正向滑移产生的最大切向粘附强度1.140N/cm^2明显大于逆向滑移产生的最大切向粘附强度0.223N/cm^2.Firstly,micrometer-sized silicone- and polyurethane- based primary structures of adhesive arrays are prepared by injection molding in vacuum,then silicone-based viscous membrane is coated onto the end of the primary array,and thus an adhesive array of secondary structure is formed.The tangent adhesion performance of those arrays is tested by micro-friction testing machine（UMT）,and the results show that,the large end structure increases the effective contact area and also improves the tangential adhesion properties;the tangent force firstly increases in a short sliding distance,then decreases, finally keeps stable in the following slide;the maximum tangential adhesion force is generated in the sliding distance of 1 mm; as the normal load increases,the adhesion force produced by the adhesive array increases,and decreases after the normal load exceeds a certain range;under the preload of 15 mN,the generated maximum tangential adhesion force is 84.668 mN;the maximum tangent adhesion strength of sliding along the seta is around 1.140N/cm^2,which is significantly higher than that of sliding against the seta,and in that direction,the maximum tangent adhesion strength is around 0.223 N/cm^2.

关 键 词：仿壁虎 刚毛 粘附阵列 

分 类 号：TB17[生物学—生物工程]