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中文摘要：
研究了表面处理剂（钛酸酯和硅烷偶联剂）对聚丙烯／纳米氢氧化镁（MH）阻燃复合材料性能的影响。通过高压毛细管流变仪、LOI、力学测试、DSC和SEM对PP／纳米MH复合体系的结构与性能进行了研究。结果表明．所选偶联剂能有效地降低复合体系的表观黏度，改善体系的流动性。未改性的纳米MH对PP基体有异相戍核作用；而表面改性剂能削弱填料对基体的异相戍核作用。改性后的纳米MH粒子以独立形式均匀分散在基体中，PP与纳米MH界面的粘接力得到了加强，复合材料的拉伸性能和冲击强度有较大幅度的提高，阻燃性能也得到了改善。
英文摘要：
Nano-magnesium hydroxide （MH）, which was modified by titanate and silane, respectively, was filled into polypropylene as a fire retardant. The effects of surface treatment on the structure and the properties of PP/MH composites were studied by rheological behaviors, mechanical tests, LOI, DSC and morphology studies. The results show that addition of nano-MH can improve flame retardancy of PP/MH composites, but deteriorate mechanical properties of composites. However, PP matrix filled with treated nano-MH can improve significantly tensile and impact strength of PP/MH composites and has little effect on flame retardancy and elongation at break of the composites. PP filled with treated nano-MH powders decreases melt viscosity of PP/MH composites, which improves their processing behavior. Nano-MH has heterogeneous nucleation on PP matrix and makes crystallization peak temperature increased. However, surface modifier can weaken heterogeneous nucleation of MH on PP/MH composites. Interfacial adhesion of PP/MH composites is significantly improved, as seen in morphology studies in the changed fracture mechanism.
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