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Cross-sectional morphologies of waterborne polyurethane (WPU) coatings with different multi-walled carbon nanotube (MWCNT) contents: (A) coating prepared by electrostatic spraying (ESC) with 0.3 wt% MWCNT, (B) ESC with 0.6 wt% MWCNT, (C) coating prepared by brushing (BrC) with 0.3 wt% MWCNT, and (D) BrC with 0.6 wt% MWCNT.
