Multiscale studies on adhesion phenomena in polymers

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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.