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中文摘要：
通过简单的工艺条件和步骤制备SiO2包覆CaCO3的核壳结构纳米复合粒子，采用硅烷偶联剂对其和纳米SiO2实心粒子进行表面改性处理，并用处理后的两种粒子分别对聚丙烯进行填充改性，然后比较其对复合材料力学性能的影响。结果表明，利用纳米SiO2／CaCO3复合粒子填充改性聚丙烯．可同时达到增强、增韧的目的，而且对材料力学性能的改性效果与纳米SiO2实心粒子的改性效果相近。
英文摘要：
Nano SiO2 solid particles are used as polymer fillers and have significant effects on the mechanical properties of polymers. However, nano SiO2 is quite expensive. With a sol-gel route, a thin SiO2 film was synthesized on the surface of CaCO3 nanoparticles, thus forming a core-shell structured SiO2/CaCO3 nano composite. After some surface modification, this SiO2/CaCO3 nano composite was filled in polypropylene （PP） at various concentrations and its effects on the mechanical properties of PP were investigated, it is found that the surface-modified SiO2/CaCO3 nano composite particles can be evenly dispersed in PP and remarkably enhance the strength and toughness of the inaterial silnultaneously with a modification efficiency close to that of SiO2 nanoparticles. However, with the core being a much cheaper CaCO3, the cost of SiO2/CaCO3 nano composite as filler can be reduced significantly, which will boost the polymer modification application by this composite filler.
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