Surface charge contribution in rubber adhesion and friction

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Abstract
A surface electrostatic charge may be generated on rubber by contact with a dissimilar material and it has been suggested that resulting electrostatic attraction may contribute significantly to the adhesion. Measurements made to determine what proportion of the work of adhesion is due to electrostatic attraction indicate a contribution of less than 10%. The investigation demonstrates, in particular, how important it is to consider the details of interface events. For smooth rubber it becomes clear that the work of adhesion in the contact region is magnified by a viscoelastic factor characteristic of the particular rubber under test and that variation in this factor swamps any increase in adhesion or rolling friction brought about by electrostatic forces.

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