Benzoxazine (BOZ) / aluminum hydroxide(ATH) castings were prepared, and the properties of polybenzoxazine were investigated. The results show that when the mass fraction of aluminum hydroxide is more than 20％, flame retardancy of polybenzoxazine/ATH can achieve the UL-94V0 grade. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) test show that with aluminum hydroxide the exothermal enthalpy of ring-opening curing reaction of benzoxazine decreases apparently and the glass transition temperature of the polybenzoxzine slightly increased. Thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM) test results show that when heated above 200℃, the endothermic decomposition of aluminum hydroxide with water release to enable the polybenzoxazine to lower the temperature and to higher char yield, and aluminum oxide generated over the polybenzoxazine carbon surface isolated air to prevent combustion.%以加入氢氧化铝(ATH)提高苯并噁嗪树脂(BOZ)的阻燃性,并对阻燃聚苯并噁嗪树脂的性能进行研究.结果表明,当氢氧化铝质量分数大于20%时,聚苯并噁嗪树脂的阻燃性可以达到UL-94V0级.差示扫描量热(DSC)和动态机械分析(DMA)测试显示氢氧化铝的加入,使苯并噁嗪树脂开环固化反应放热热焓和峰值温度均有降低,使聚苯并噁嗪树脂的玻璃化转变温度略有升高.热失重分析(TGA)和扫描电镜(SEM)测试结果表明在聚苯并噁嗪树脂受热时,氢氧化铝先行分解吸热,使体系温度降低,同时氢氧化铝还可以促进聚苯并噁嗪残炭,并且生成三氧化二铝覆盖在聚苯并噁嗪树脂炭层表面,起到隔绝空气,阻止燃烧的作用.
展开▼
