用熔融共混法制备了膨胀阻燃剂填充长玻纤增强聚丙烯(PP/LGF)复合材料，并采用热烘箱老化法，研究了140℃条件下不同热氧老化时间对复合材料热氧老化性能的影响。通过热分析、锥形量热、极限氧指数、垂直燃烧测试对其热解和燃烧性能进行了研究。结果表明，随着老化时间的延长，PP/LGF复合材料的极限氧指数值明显提高，且垂直燃烧等级基本保持不变；并且复合材料的热释放速率峰值、热释放速率平均值和总热释放速率值不断增大。热氧老化对PP/LGF复合材料的最大热失重速率所对应的温度无太大影响，但却显著降低了复合材料的起始分解温度。%The composite based on long glass fiber reinforced polypropylene (PP/LGF) filled with intumescent flame retardant were prepared by melt blending. The thermal-oxidative aging properties of the composite with different thermal exposure time at 140℃were studied by means of oven heating. Their thermal degradation mechanism and combustion properties were investigated by thermal gravimetry,cone calorimetry,limited oxygen index(LOI),and UL 94 tests. The test results show that LOI of PP/LGF composite increase significantly and vertical burning rating nearly remain unchanged as the aging time lasted;what’s more,thefirst peak and mean value of heat release rate and total heat release rate increase. Meanwhile,the temperature corresponding to maximum heat loss rate nearly remain unchanged but initial decomposition temperature decrease significantly after thermal oxidative aging.
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