利用环氧树脂（EP）成炭能力,引入聚磷酸铵（APP）以提高其阻燃性能。当APP质量分数为9%时,EP/APP氧指数达30.5%,垂直燃烧性能通过V-0级。相比EP,EP/APP的热释放峰值与总热释放均有所下降。此外,利用热失重-红外联用设备研究了EP以及EP/APP的热降解行为并解释相关机理：EP在高温下会释放CO、甲醇等易燃性气体,剧烈燃烧并放出大量的热;APP在低温阶段的热裂解产物会催化EP的降解,但在高温下EP/APP却有热稳定性优异的炭层形成,在火灾中此炭层会覆盖在基体表面保护下部材料以免其遭到进一步的破坏。
Ammonium polyphosphate（APP） was used as flame retardant to improve the flame retardant properties of epoxy resin（EP）.The flame retardancy and thermal properties of EP and EP/APP composites were investigated by limiting oxygen index（LOI）,UL-94,thermogravimetry（TG）,microscale combustion calorimeter（MCC） and TGFT-IR.EP/APP composites with only 9% APP can pass V-0 in UL-94 test,while neat EP can＇t pass any rating.The presence of APP can reduce the heat release rate and total heat release of EP in MCC test.The reason is that APP can stimulate the dehydration of EP at low temperature and retard the release of flammable pyrolysis gas（CO,CH3OH,etc.） at high temperature.Moreover,a char formed via the reaction of EP and APP has excellent thermal stability and can prevent underlying materials from further combustion during a fire.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%