In the designing process of an outer sole of a shoe, the grip properties on various surfaces must be considered, for example on wet marble, wet manholes and oily floors in kitchens and factories. It is known that adhesion between rubber and a floor has an influence on static and dynamic friction coefficients. Thus, it is expected that surface and interfacial free energies of rubber, floors, and lubricants contribute to static and dynamic friction coefficients under lubricated conditions. Spreading coefficient derived from interfacial free energies of the rubber, the floor and the lubricant indicates spreading ability of lubricant between the rubber and the floor. Work of adhesion derived from surface and interfacial free energies of the rubber and the floor indicates peel-off work of this system. In this paper, the relation among static and dynamic friction coefficients, spreading coefficients and work of adhesion were investigated. The results explained that both the static and dynamic friction coefficients had negative correlations to the spreading coefficients. On the other hand, the positive correlations between both friction coefficients and work of adhesion were obtained.
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