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. 2020 Jun 9;6(6):e04177. doi: 10.1016/j.heliyon.2020.e04177

Figure 15.

Figure 15

SEM images and the WCAs (inset) of PVC-PS-SiO2 nanocomposite films on a glass substrate; (a) as-prepared, and annealed at (b) 100 °C and (c) 200 °C.