The formulations of RPUFs.
| Sample | HSBP content (wt%) | DOPO–HSBP content (wt%) | T–D content (wt%) | AK8805 content (wt%) | DBTDL content (wt%) | H2O content (wt%) | Isocyanate index [n(–NCO)/n(–OH)] |
|---|---|---|---|---|---|---|---|
| PPUF-0 | 100 | 0 | 0 | 3 | 1 | 1.5 | 1.1 |
| PPUF-10 | 90 | 10 | 0 | 3 | 1 | 1.5 | 1.1 |
| PPUF-20 | 80 | 20 | 0 | 3 | 1 | 1.5 | 1.1 |
| PPUF-30 | 70 | 30 | 0 | 3 | 1 | 1.5 | 1.1 |
| PPUF-40 | 60 | 40 | 0 | 3 | 1 | 1.5 | 1.1 |
| PPUF-50 | 50 | 50 | 0 | 3 | 1 | 1.5 | 1.1 |
| NPUF-0 | 90 | 0 | 10 | 3 | 1 | 1.5 | 1.1 |
| NPUF-10 | 80 | 10 | 10 | 3 | 1 | 1.5 | 1.1 |
| NPUF-20 | 70 | 20 | 10 | 3 | 1 | 1.5 | 1.1 |
| NPUF-30 | 60 | 30 | 10 | 3 | 1 | 1.5 | 1.1 |
| NPUF-40 | 50 | 40 | 10 | 3 | 1 | 1.5 | 1.1 |
| NPUF-50 | 40 | 50 | 10 | 3 | 1 | 1.5 | 1.1 |