化学学报 ›› 2003, Vol. 61 ›› Issue (10): 1675-1678. 上一篇    下一篇

研究论文

嵌段共聚物与阳离子表面活性剂混合模板合成介孔SiO_2

马玉荣;齐利民;马季铭;程虎民   

  1. 北京大学化学学院
  • 发布日期:2003-10-15

Synthesis of Mesoporous Silica Using Block Copolymer-Cationic Surfactant Mixtures as Templates

Ma Yurong;Qi Limin;Ma Jiming;Cheng Humin   

  1. College of Chemistry, Peking University
  • Published:2003-10-15

利用三嵌段共聚物EO_(20)PO_(70)EO_(20)与阳离子表面活性剂CTAB作为混合 模板合成了内部孔结构与外观形貌同时受到调控的介孔氧化硅。与使用单一共聚物 模板制备的介孔氧化硅相比,在混合模板作用下得到的介孔氧化硅的孔结构有序度 降低,而孔径则随混合模板中共聚物的质量分数的降低而减小。在EO_(20)PO_(70) EO_(20)与CTAB质量比为1:1时可得到形貌完好、表面光滑的介孔氧化硅微米球,其 平均孔径为3.2nm,比表面积为972m~2/g。

关键词: 氧化硅, 嵌段共聚物, 孔径, 模板聚合, 溴代十六烷基三甲胺

Mixtures of triblock copolymer EO_(20)PO_(70)EO_(20) and cationic surfactant CTAB have been used as mixed templates for the synthesis of mesoporous silica with tailored pore structures and exterior morphologies. Compared with the mesoporous silica obtained by using single copolymer template, the pore structure of the mesoporous silica obtained by using the mixed templates is less ordered and its pore size decreases with decreasing weight fraction of the copolymer in the mixed templates under the studied conditions. Micrometer-sized mesoporous silica spheres (1.5 ~ 4 μm) with smooth surfaces, which have an average pore size of 3.2 ran and a BET surface area of 972 mVg, can be prepared at 1:1 weight ratio between EO_(20)PO_(70)EO_(20) and CTAB.

Key words: SILICON OXIDE, BLOCK COPOLYMER, PORE SIZE, MATRIX POLYMERIZATION, CTMAB

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