用溶胶-凝胶法制备了表面含可聚合官能团的亚微米SiO2粒子,利用在其表面的乳液聚合成功制备了具有核-壳结构的SiO2-聚甲基丙烯酸甲酯(PMMA)-甲基丙烯酸缩水甘油酯(GMA)复合粒子,通过TEM、FTIR和TGA对其结构进行了表征;然后制备了SiO2-PMMA-GMA/环氧树脂复合材料,利用SEM观察其断裂形貌,并分析了复合粒子增韧环氧树脂的机制.结果表明:SiO2为复合粒子的内核,粒径约为180 nm,其表面被PMMA-GMA聚合物包覆,厚度约为20 nm;PMMA-GMA聚合物与SiO2的质量比为87.4％,PMMA-GMA聚合物对SiO2的接枝率及PMMA-GMA聚合物的有效接枝率分别为77.0％和88.1％;当SiO2-PMMA-GMA复合粒子在环氧树脂中的含量为4wt％时,其固化后的冲击强度可由19.2 kJ/m2增加到42.0 kJ/m2.
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