Figure 1. Comparison of contact angle at various surface-treatment time.
Figure 2. SEM micrographs of PP fiber surface: (a) bare, (b) plasma treated, (c) PVP coated on bare PP, (d) PVP coated on plasma treated PP.
Figure 3. SEM micrographs of PVP-coated PP fibers: (a) bare, (b) 0.5 wt(%) PVP solution, (c) 1 wt(%) PVP solution, (d) 2 wt(%) PVP solution, (e) 3 wt(%) PVP solution.
Figure 4. SEM micrographs of (a) bare and (b) PVP hydrogel coated PP fibers.
Figure 5. Thickness changes of PP fiber with various concentrations of PVP solution.
Figure 6. Photographs of water droplet at 80% relative humidity on (a) bare PP after 1h, (b) bare PP after 14 h, (c) PVP hydrogel coated PP after 1h, (d) PVP hydrogel coated PP after 5h, (e) PVP hydrogel coated PP after 24 h.
Figure 7. Optical microscope images of (a) bare PP fiber and (b) PVP hydrogel coated PP fiber.
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