| 草莓型SiO2/PMMA纳米复合微球的制备 |
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| 引用本文： | 陈敏,游波,周树学,武利民.草莓型SiO2/PMMA纳米复合微球的制备[J].高等学校化学学报,2005,26(7):1352-1355. |
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| 作者姓名： | 陈敏 游波 周树学 武利民 |
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| 作者单位： | 复旦大学材料科学系,上海,200433 |
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| 基金项目： | 上海市纳米科技专项基金 |
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| 摘 要： | 在纳米二氧化硅水分散体系中,借助于碱性辅助单体1-乙烯基咪唑(1-VID)与未改性纳米二氧化硅表面羟基之间的酸-碱作用,通过1-VID与甲基丙烯酸甲酯(MMA)的自由基共聚合,制备了草莓型的SiO2/PMMA复合微球.整个反应过程中,纳米二氧化硅无需表面处理,体系中无需另外加入乳化剂或助乳化剂,微球表面吸附的纳米二氧化硅对颗粒起稳定作用.用动态光散射粒度分布仪测得复合微球粒径在120-330nm之间,热重分析结果表明,复合微球中二氧化硅含量介于15%-20%之间.透射电镜和扫描电镜显示所得复合微球具有草莓型结构,二氧化硅富集在表面.
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| 关 键 词： | 草莓结构 二氧化硅 复合微球 |
| 文章编号： | 0251-0790(2005)07-1352-04 |
| 收稿时间： | 2004-07-01 |
Preparation of Raspberry-like SiO2/PMMA Nanocomposite Spheres |
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| CHEN Min,YOU Bo,ZHOU Shu-xue,WU Li-min.Preparation of Raspberry-like SiO2/PMMA Nanocomposite Spheres[J].Chemical Research In Chinese Universities,2005,26(7):1352-1355. |
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| Authors: | CHEN Min YOU Bo ZHOU Shu-xue WU Li-min |
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| Institution: | Department of Materials Science, Fudan University, Shanghai 200433, China |
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| Abstract: | Water-borne raspberry-like silica/PMMA nanocomposite particles were prepared via a free radical copolymerization of MMA(methyl methacrylate) with 1-VID(1-vinylimidazole) in the presence of ultrafine aqueous silica sols. The silica needn't be pretreated or modified and no surfactant was added in this preparation method. The strong acid-base interaction between the surface hydroxyl groups of silica particle with 1-VID was strong enough for promoting the formation of long-stand stable silica/PMMA nanocomposite particles. The average particle sizes of the obtained nanocomposite particles ranged from 120 nm to 350 nm, depending on the precise formulation. Thermogravimetric analysis indicates the silica content in the nanocomposite particles ranged from 15 to 20. TEM and SEM indicate a raspberry-like morphology of the nanocomposite particles. |
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| Keywords: | Raspberry-like structure Silica Nanocomposite spheres |
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