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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180nm,其表面被PMMA-GMA聚合物包覆,厚度约为20nm;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19.2kJ/m2增加到42.0kJ/m2。
Submicron SiO2 particles with polymerizable functional groups on the surface were prepared by sol-gel method. SiO2-PMMA-PMMA with core-shell structure was successfully prepared by emulsion polymerization on its surface. Glycidyl methacrylate (GMA) composite particles were synthesized and characterized by TEM, FTIR and TGA. Then the SiO2-PMMA-GMA / epoxy composites were prepared and the fracture morphology was observed by SEM. Toughening epoxy resin mechanism. The results showed that SiO2 was the core of the composite particles with a particle size of about 180 nm and the surface was coated with PMMA-GMA polymer with a thickness of about 20 nm. The mass ratio of PMMA-GMA polymer to SiO2 was 87.4% The grafting ratio of SiO2 to PMMA-GMA polymer and the effective grafting rate of PMMA-GMA polymer were 77.0% and 88.1% respectively. When the content of SiO2-PMMA-GMA composite particles in epoxy resin was 4wt% Impact strength can be increased from 19.2kJ / m2 to 42.0kJ / m2.