Physical Structure Induced Hydrophobicity Analyzed from Electrospinning and Coating Polyvinyl Butyral Films

Figure 3

3D surface roughness of the prepared PVB films under spin-coating 250 r/s (a), bar-coating 6 μm (b), positive electrospinning 15 cm (c), and negative electrospinning 15 cm (d). The inset images showed the 2D surface roughness of these films.

(a)

(b)

(c)

(d)