Figure 2.
SEM cross section images of (a) pure PU film, (b) pure PVP film, (c) PU/PVP_50/50 hybrid film and (d) PU/PVP_75/25 hybrid. AFM height and phase images for PU/PVP_90/10 (e,h), PU/PVP_75/25 (f,i) and PU/PVP_50/50 (g,j).
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