Effect of Nanosilica Filled Polyurethane Composite Coating on Polypropylene Substrate

Figure 8

Optical micrographs of the worn surface of PU/nano-SiO₂ composite coated PP with various content of nano-SiO₂ (a) 0 wt%, (b) 3 wt%, and (c) 7 wt% (0.2 kg, 100 rpm, 10 min).

(a)

(b)

(c)