A systematic method for characterizing the elastic properties and adhesion of a thin polymer membrane
A systematic method for characterizing the elastic properties and adhesion of a thin polymer membrane
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DOI：
10.1016/j.ijmecsci.2005.02.006
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发表时间：
2005-03
影响因子：
7.3
通讯作者：
Bingfeng Ju;Y. Ju;M. Saka;Kuo-Kang Liu;K. Wan
中科院分区：
文献类型：
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作者：
Bingfeng Ju;Y. Ju;M. Saka;Kuo-Kang Liu;K. Wan
硅橡胶薄膜的弹性和粘附力已得到表征。开发了一种有效的仪器，包括视频增强显微镜，可满足 0.1μN 和 10nm 的力和位移分辨率。它能够同时测量聚合物薄膜所施加的力和由此产生的位移。应用线性理论弹性解来定量解释在圆形同心载荷下测量的膜的中心挠度。一旦已知施加的力和中心偏转以及基本尺寸，就可以轻松确定膜的杨氏模量。当冲头接近冲头-膜间隙上的表面间力的范围时，膜跳入粘附接触。当拉伸载荷达到临界阈值时，在非零接触圆处观察到拉脱事件。实验与基于线弹性和能量平衡的理论模型基本一致。新方法可用于测量具有残余应力的预应力超薄生物膜和薄壁生物胶囊的力学行为。
The elastic properties and adhesion of a thin silicone rubber membrane have been characterized. An effective instrumentation embodying a video-enhanced microscope, which meets force and displacement resolution of 0.1μN and 10nm, was developed. It provides the capability of simultaneously measuring both the applied force and the resultant displacement of the thin polymer membrane. A linear theoretical elastic solution was applied to quantitatively interpret the measured central deflection of the membrane under a circular concentrical load. Young's modulus of the membrane can be easily determined once the applied force and the central deflection, together with the essential dimensions, are known. The membrane jumped into an adhesion contact when the punch approached the range of the inter-surface force across the punch-membrane gap. A pull-off event was observed at a nonzero contact circle when the tensile load reached a critical threshold. The experiment is basically consistent with a theoretical model based on linear elasticity and an energy balance. The new method can be used to measure mechanical behavior of prestressed ultra-thin biomembranes and thin walled biocapsules with a residual stress.