应用聚磷酸铵(APP)对苯并噁嗪(BOZ)树脂及玻璃纤维(GF)/BOZ复合材料进行了阻燃改性,结合热分析和微观形貌分析等研究了材料的阻燃机制.结果表明:APP可以明显提高BOZ树脂的阻燃性能,随APP含量的提高,树脂体系的极限氧指数逐渐提高,添加量为3wt％时可使BOZ树脂的极限氧指数从基体的31.5％提高到34.5％,并达到UL 94 V-0级.APP的加入使改性树脂体系的分解温度前移,玻璃化转变温度略有下降,改性树脂体系固化反应提前,反应过程变得缓和.APP的加入使GF/BOZ复合材料的阻燃性能进一步提高,10wt％GF/APP-BOZ复合材料的极限氧指数从GF/BOZ的51.o％提高到57.7％.微观形貌分析表明:APP的加入使APP-BOZ改性树脂及GF/APP-BOZ复合材料燃烧后生成更为致密的炭层,从而使材料的阻燃性能得到提高.
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