中文摘要：

以有机改性纳米SiO2和MgAl-SDBS-LDH为填料,采用熔融共混法制备PP/MgAl-SDBS-LDHs、PP/MgAl-SDBS-LDHs/SiO2复合材料。采用XRD、TGA、氧指数仪、水平垂直燃烧仪和锥形量热仪等方法,探讨纳米SiO2、MgAl-SDBS-LDHs在聚丙烯中的协同分散及协效阻燃性能。结果表明：相比PP/MgAl-SDBS-LDHs,PP/MgAl-SDBS-LDHs/SiO2复合材料体系的分散性得到明显改善。PP/5%MgAl-SDBS-LDHs/10%SiO2复合材料的初始分解温度较纯PP升高62℃,残留量达到11.18%。样品达到UL-94水平燃烧测试标准,极限氧指数（LOI）提高3.8,平均质量损失速率（AMLR）下降1.8g/（m2·s）,生烟总量（TSP）增加4.7m2,热释放速率峰值（PHRR）下降41%。有机改性纳米SiO2改善了MgAl-SDBS-LDHs在聚丙烯中的分散性并提高了复合材料的阻燃性能。

英文摘要：

PP/MgAl-SDBS-LDHs and PP/MgAl-SDBS-LDHs/SiO2 composites were prepared by melt blen- ding method, using MgAl-SDBS-LDHs and nano-silicon as filler. XRD, TGA, limiting oxygen index （LOI）, UL-94 test and cone calorimeter were used to investigate the synergistic dispersibility and flame retardance of nano-SiOz and MgAl-SDBS-LDHs in polypropylene. The results showed that the dispersibility of MgAl-SDBS-LDHs in the compo- sites was improved because of the addition of nano-silieon. The onset temperature of degradation of PP/5~MgAI-SD- BS-LDHs/10%SiO2 composite was 62 ℃ higher than that of neat PP and the residues increased to 11. 18%. All the composite samples could reach to UL-94 grade. The limiting oxygen index of composite increased by 3.8, the average mass loss rate （AMLR） decreased by 1.8 g/（m2·s）, the total smoke production （TSP） increased by 4. 7 mz and the peak heat release rate （PHRR） decreased by 41% compared to PP. The addition of nano-SiO2 improves the flame re- tardancy of PP/MgAbSDBS-LDHs composites.