Oxygen index of flame retardant thermoset polylactic acid with different DOPO content.
| Sample | DOPO (wt%) | P content (wt%) | LOI (%) |
|---|---|---|---|
| TSPLA | 0 | 0 | 22.9 |
| TSPLA–DOPO5 | 5 | 0.72 | 25.3 |
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