Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, USA.
Langmuir. 2013 Sep 3;29(35):11022-7. doi: 10.1021/la4013526. Epub 2013 Aug 22.
The adhesive response of a rigid flat cylindrical indenter in contact with a compliant elastic layer of varying confinement is investigated experimentally and described analytically. Using a soft elastic gel with substrate thickness, t, and indenter radius, a, 28 unique combinations of the confinement parameter, a/t, are examined over a range of 0.016 < a/t < 7.2. Continuous force capacity predictions as a function of a/t and material properties are provided through a scaling theory and are found to agree well with the experimental data. We further collapse all of the data over orders of magnitude in adhesive force capacity onto a single line described by a generalized reversible adhesion scaling parameter, A/C, where A is the contact area and C is the compliance. As the scaling analysis does not assume a specific separation mechanism the adhesive force capacity is well described during both axisymmetric edge separation and during interfacial fingering and cavitation instabilities. We discuss how the geometry of the contact, specifically increasing the degree of confinement, allows reversible adhesive materials to be designed that are not "sticky" or "tacky", yet can be very strong and provide high performance.
刚性平圆柱压头与具有不同约束的柔顺弹性层接触的粘附响应通过实验进行了研究，并进行了分析描述。使用具有基底厚度 t 和压头半径 a 的柔软弹性凝胶，在 0.016 < a/t < 7.2 的范围内检查了约束参数 a/t 的 28 个独特组合。通过缩放理论提供了连续力容量预测作为 a/t 和材料特性的函数，并且发现与实验数据吻合良好。我们进一步将所有的粘附力容量数据压缩到一个由广义可逆粘附缩放参数 A/C 描述的单个线上，其中 A 是接触面积，C 是柔量。由于缩放分析不假设特定的分离机制，因此在轴对称边缘分离以及界面指状和空化不稳定性期间，粘附力容量都得到了很好的描述。我们讨论了接触的几何形状，特别是增加约束程度，如何允许设计出不是“粘性”或“粘性”的可逆粘附材料，但可以非常强并且提供高性能。
