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increasing temperature up to Tg, polymer surfaces become more plastic with a decline in their elastic property caused by thermally activated molecular relaxation, which results in increased real contact area and thus higher adhesion at the interface (Hanchi and Eiss, 1997 and Zhang et al., 2008). However, despite the thermal relaxation of polymer materials, the molecular mobility is still limited below Tg, and thus there’s only a small decrease in their shearing strength. Therefore, with increasing temperature up to Tg, the increased real contact area and adhesion in the interfacial zone is dominant, compared to the reduced shearing strength in the subsurface zone, thus resulting in an increase in the COF. However, once the NCT exceeds Tg, the polymer enters a rubbery state due to the complete scission of molecular chains, thus resulting in rapid and abrupt decline of polymer viscosity and shearing strength. Under this higher temperature condition (> Tg), the adhesion of the interfacial zone doesn’t play a significant role in the frictional behavior of the polymer surface, and it is dominated by the rapidly reduced shearing strength of the subsurface zone. Therefore, once the NCT exceeds Tg, the COF decreases with increasing temperature, which was clearly observed in the present work, Figure 5.6, in agreement with Refs. Hanchi and Eiss (1997), Zhang et al. (2006), Zhang et al. (2008), and Lu and Friedrich (1995). In summary, with increasing NCT by whatever reasons (increased sliding speed, normal load or setting temperature), a polymer surface becomes more plastic and in the vicinity of Tg results in the highest COF. Under this condition, more plastic deformation and plowing are observed on the worn surfaces (Hanchi and Eiss, 1997 and Zhang et al., 2008). Then, as the NCT exceeds Tg, the COF starts to decrease due to the rapid decline 90PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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