Figure 3
Mechanical robustness of the coating surface using PET film coated on one side. (a) Photograph of the custom-made rubbing machine (inset: zoomed-in view of the tip and the sample). (b) Schematic illustration of the coating material on a transparent substrate. Due to the presence of BP, UV light irradiation causes covalent bonding of PFPE-BP with the substrate and the hard coating materials. (c) Coefficient of friction as a function of the normal load of the coating surface. Due to covalent bonding, the developed coating material withstands a high normal load force of 58Â g. (d) Water contact angle as a function of abrasion cycle at a normal load of 10Â g (insets show photographs of water droplets on the surface before and after 1,000 abrasion cycles). (e) Reflectance as a function of wavelength for selected abrasion cycles (0, 500, and 1,000).
