纳米Al_2O_3对含磷环氧树脂体系的性能影响

研究了以纳米Al_2O_3作为协同阻燃剂,对EP/DOPO和EP/HPCTP树脂固化物阻燃性能的影响。通过热重分析测试(TGA)、动态热机械分析测试(DMA)、氧指数测定(LOI)及垂直燃烧测试(UL-94)重点探讨了树脂固化物的耐热及阻燃性能。测试结果表明,含磷阻燃剂有助于提高环氧树脂固化物的阻燃性能,但会降低其玻璃化转变温度(Tg)。随着纳米Al_2O_3的加入,残炭率(800℃)、极限氧指数(LOI)得到进一步的提高,并且能够在一定程度上提升树脂固化物的玻璃化转变温度(Tg)和初始热裂解温度(T5%)。

THE INFLUENCE OF NANO-Al2O3 ON THE PROPERTIES OF PHOSPHORUS-CONTAINING FLAME RETARDED EPOXY RESINS

In this work,nano-Al2O3 was used as the synergistic flame retardant to study its influence on the flame retardancy of the EP/DOPO and EP/HPCTP thermosets.The thermal stability and flame retardancy of the neat EP and flame retarded EP thermosets were studied by thermogravimetric analysis (TGA),dynamic thermomechanical analysis (DMA),limiting oxygen index (LOI) and UL-94 vertical burning test.The results indicated that the phosphorus-containing flame retardant (DOPO or HPCTP) contributed to improving the flame retardancy of the cured EP resins.However,it will result in the decrease of the Ts of the cured EP resins.Nevertheless,Nano-Al2O3 not only increased the char yield at 800 ℃ and LOI of the cured EP resins,but also improved the Ts and onset decomposition temperature of the cured EP resins to some extent.When the content of nano-Al2O3 was 4％ in the cured EP resins,the LOI of EP-DOPO-Al2O3-4phr and EP-HPCTP-Al2O3-4phr achieved 36.4％ and 41.0％,and UL-94 V-0 rating was obtained,which indicated that nano-Al2O3 was an effective synergistic flame retardant to improve the flame retardancy of the EP/DOPO and EP/HPCTP thermosets.