Table 5.
Adjusted silica content, glass transition temperature and fracture toughness of DOPO and nano-SiO2 modified epoxy resin.
| Phosphorous Content/wt.% | Nano-SiO2 Content/vol.% | Tg/°C | GIc/J/m2 | |
|---|---|---|---|---|
| Novolac + 2 P | 2.0 | 0.0 | 81.9 ± 0.9 | 107.3 ± 12.0 |
| Novolac + 2 P + 2.7 SiO2 | 2.0 | 2.7 | 78.2 ± 0.1 | 201.9 ± 31.4 |
| Novolac + 2 P + 4.4 SiO2 | 2.0 | 4.4 | 75.6 ± 0.1 | 220.8 ± 15.9 |
| Novolac + 3 P | 3.0 | 0.0 | 66.5 ± 0.6 | 131.8 ± 27.5 |
| Novolac + 3 P + 2.8 SiO2 | 3.0 | 2.8 | 63.8 ± 0.1 | 206.8 ± 37.3 |
| Novolac + 3 P + 4.7 SiO2 | 3.0 | 4.7 | 62.2 ± 0.1 | 243.1 ± 17.4 |