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SEM images of the specimens’ side surfaces: (a) ×30 magnification of PP/TiO2 0.5 wt.%; (b) ×150 magnification of PP/TiO2 0.5 wt.%; (c) ×30 magnification of PP/TiO2 2 wt.%; (d) ×150 magnification of PP/TiO2 2 wt.%; (e) ×30 magnification of PP/TiO2 4 wt.%; and (f) ×150 magnification of PP/TiO2 4 wt.%.
