Table 5. Effect of Additive on Thermal Stability and Glass Transition Temperatures of Cured Polybenzoxazinesa.
| temp (°C)
for a given mass loss (%) |
|||||
|---|---|---|---|---|---|
| sample | initiator (mol %) | 5% | 10% | char yield (%) | Tg (°C) |
| BA-a | 240 | 305 | 25 | 150 | |
| TDP (12) | 252 | 308 | 31 | 154 | |
| TDP (25) | 264 | 305 | 28 | 151 | |
| TDA (15) | 200 | 246 | 37 | 184 | |
| TDA (30) | 254 | 306 | 26 | 186 | |
| BF-a | 301 | 353 | 48 | 165 | |
| TDP (12) | 214 | 312 | 48 | 164 | |
| TDP (25) | 266 | 324 | 45 | 158 | |
| TDA (15) | 265 | 338 | 42 | 199 | |
| TDA (30) | 269 | 336 | 400 | 204 | |
| BT-a | 313 | 334 | 57 | 160 | |
| TDP (12) | 381 | 311 | 54 | 195 | |
| TDP (25) | 268 | 302 | 52 | 178 | |
| TDA (15) | 280 | 316 | 52 | 179 | |
| TDA (30) | 270 | 310 | 47 | 183 | |
a
All samples analyzed under nitrogen at a heating rate of 10 K/min. Char yield determined as residue remaining at 800 °C.