Table 2. XPS analysis of the O/C ratio on the surface of UVO-treated plastics after 16 weeks under different storage conditions.
| PMMA | COC | PC | |
| Air | 0.27 | 0.31 | 0.34 |
| Dehumidified | 0.41 | 0.38 | 0.38 |
| Vacuum | 0.34 | 0.34 | 0.36 |
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