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| Samples | CI (%) | T max (°C) | The residue after 550 °C (%) | Transparency (%) |
|---|---|---|---|---|
| PVA film | 74.8 | 336.3 | 8.0 | 86.4 |
| PVA–CNFs 1% | 77.7 | 336.2 | 7.7 | 83.6 |
| PVA–CNFs 2% | 77.3 | 334.1 | 7.4 | 83.2 |
| PVA–CNFs 3% | 77.9 | 335.6 | 7.1 | 86.8 |
| PVA–CNFs 4% | 78.8 | 341.8 | 5.4 | 86.0 |
| PVA–CNFs 5% | 77.4 | 341.2 | 6.2 | 88.1 |
