Multiscale studies on adhesion phenomena in polymers

软聚合物橡胶通常与固体表面紧密结合，如压敏胶粘剂。当这些材料从表面剥离时，在接触线（接触区域的外缘）附近出现各种中尺度结构（具有um数量级的尺度），如空腔和原纤维。我们研究了胶粘剂与固体基材的脱粘以及胶粘剂橡胶在固体基材上的滑动过程中的这种细观尺度结构，阐明了这种细观尺度结构与宏观力学响应的关系。特别地，我们得到了胶粘剂接触线的动力学模型。我们还提出了一种计算橡胶在基底上滑动时所产生的应变分布的方法，并讨论了其与地震发生的关系。

Soft polymeric rubbers often adhere to solid surfaces strongly as in the case of pressure sensitive adhesives. When such materials are debonded from the surface, various meso-scale structures(having the scale of order of um) such as cavities and fibrils appear nearby the contact line(the outer rim of the contact region). We have studied such meso-scale structure in the debonding of adhesives from sold substrate, and in the sliding of adhesive rubber on solid substrate, and clarified the relation between the mesoscale structure and the macroscopic mechanical responses. Especially, we have obtained a model for the dynamics of the contact line of adhesive rubber. We have also psoposed a way of obtaining the strain distribution built up in the rubber sliding over a substrate, and discussed the relation to the occurance of eathquakes.