本文应用示差量热扫描法(DSC)、动态热机械分析(DMA)和热失重(TGA)对氢氧化镁改性苯并噁嗪树脂的固化行为和热性能进行了研究。结果表明,氢氧化镁的加入对苯并噁嗪树脂的固化反应基本没有影响。DMA测试结果表明,氢氧化镁的加入使聚苯并噁嗪体系的玻璃化转变温度略微有所增高,室温下的储能模量略有增加。TGA测试结果表明,氢氧化镁的加入使聚苯并噁嗪体系的热稳定性提高,起始分解温度和800℃残重均有所提高。 In this paper, the curing behavior and thermal properties of magnesium hydroxide-modified benzoxazine resin were studied by differential scanning calorimetry (DSC), dynamic thermomechanical analysis (DMA) and thermal gravimetric (TGA). The results show that the addition of magnesium hydroxide has no effect on the curing reaction of benzoxazine resin. DMA test results show that the addition of magnesium hydroxide polybenzoxazine system, the glass transition temperature slightly increased storage modulus at room temperature slightly increased. TGA test results show that the addition of magnesium hydroxide polybenzoxazine system increased thermal stability, initial decomposition temperature and residual weight at 800 ℃ have increased.