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SiO2PMMA-GMA亚微米复合粒子的制备及其对环氧树脂的改性

, PP. 1148-1153

Keywords: 乳液聚合,包覆,亚微米复合粒子,核-壳结构,环氧树脂

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Abstract:

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。

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