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Surface free energy of WPU and WPU/Silica coatings.
| Sample | Surface Free Energy (mJ/m2) | ||
|---|---|---|---|
| γd | γp | γ | |
| WPU | 5.23 ± 0.88 | 27.64 ± 4.43 | 32.87 ± 3.55 |
| WPU/Silica-1.0-B | 9.84 ± 0.51 | 16.80 ± 0.76 | 26.64 ± 0.78 |
| WPU/Silica-1.0 | 9.57 ± 2.16 | 15.70 ± 4.68 | 25.27 ± 2.52 |
| WPU/Silica-2.0 | 12.17 ± 0.93 | 9.37 ± 1.01 | 21.54 ± 1.02 |
