Abstract
The interface, properties of boundary films are commonly characterized try the measurement of the interface shear stress, τ, which is defined as the, fictional force per unit area of contact. The parameter τ has been observed to be a strong function of several contact mechanical variables which include the contact pressure, the temperature, the sliding velocity and the contact time, τ is also found to be a strong function of the processing methods used in the preparation of polymer films. It is this facet of the functionality of τ that is pursued in the present paper with an emphasis upon the apparent ductile or brittle lubrication modes, the locus of the shear zone and the molecular architectures which are responsible for these resultant lubrication modes.
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