Superhydrophobic Polyimide via Ultraviolet Photooxidation: The Evolution of Surface Morphology and Hydrophobicity under Different Ultraviolet Intensities

Figure 3

SEM images of UV (15 mW/cm²)/FAS-treated PI films. The UV treatment periods are 24 h (a, e), 48 h (b, f), 72 h (c, g), and 144 h (d, h), respectively.

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