Friction, Adhesion and Boundary Lubrication of Polymers

This review discusses the mechanism of polymer friction in terms of adhesion and deformation processes. It suggests that the deformation term is the only certain factor that can be directly related to the bulk viscoelastic properties of the polymer. The mechanism of adhesion is then discussed in terms of electric surface charges and van der Waals forces and it is suggested that a simple monistic view is not valid. The adhesion component of friction depends on speed, temperature and contact pressure in a manner implying a close correlation with bulk viscoelastic properties. This appears to be reasonably valid for rubbers but less so for thermoplastics. Reasons for this are discussed and some of the inadequacies of current theories of polymer friction analysed. In particular it is suggested that too much emphasis has been placed on “getting the right answer” and too little on determining what actually takes place during sliding itself. Certain aspects of fluid and solid lubrication are reviewed.

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