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corresponding to the depth of the coating thickness (Zhang et al., 2008). The frictional force resulting from the adhesion equals the product of the “real contact area” of the interfacial zone (with the counterpart) and the “shear stress” of the subsurface zone (Chang et al., 2007). The real contact area between two counterparts is directly related to the viscoelastic property of the interfacial zone, which is eventually determined by the interfacial temperature (NCT). Usually the decreased elastic modulus (more plastic) of a polymer surface at higher temperatures, results in an increase in the real contact area, thus inducing more adhesion (mainly Van der Waals and hydrogen bonding for most polymers). However, at the same time, the shearing strength of the subsurface zone is also determined by its viscoelastic property, and softened polymers (less viscous) at high temperatures are supposed to have lower shearing strength. Therefore, increased NCT, results in two contrary effects on the COF; the increased real contact area and the decreased shear strength. Depending on which effect is more dominant, the final value of the COF can be either increased or decreased with elevated temperature. Therefore, it can be concluded that the overall friction behavior of a polymer surface is determined by the viscoelastic property of the polymer, which directly depends on the NCT. There are five regions of viscoelastic behavior of polymers with increasing temperature. These are glassy, transition, rubbery, rubbery flow, and liquid flow regions, depending on the value of relaxation modulus (Brinson and Brinson, 2008). Among them, the transition region near the glass transition temperature (Tg) is known as the critical point determining the overall tribological behavior of a polymer surface. This is because in this region the viscoelastic property of polymers changes significantly. With 89PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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