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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (5): 505-510. 上一篇    下一篇

研究论文

温敏性介孔复合材料PNIPAAm/SBA-15的制备与表征

田博士，杨春*   

  1. (南京师范大学化学与环境科学学院 江苏省生物功能材料重点实验室 南京 210097)
  • 投稿日期:2007-07-26 修回日期:2007-10-08 发布日期:2008-03-14
  • 通讯作者: 杨春

Preparation and Characterization of Thermo-sensitive Mesoporous PNIPAAm/SBA-15 Composite

TIAN Bo-Shi, YANG Chun*   

  1. (Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097)
  • Received:2007-07-26 Revised:2007-10-08 Published:2008-03-14
  • Contact: TIAN Bo-Shi

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被引次数

21 | 8

采用自由基引发原位聚合(in situ polymerization)的方法合成了温敏性聚N-异丙基丙烯酰胺(PNIPAAm)/介孔分子筛SBA-15纳米复合物. 用FT-IR、XRD、TEM、低温N2吸附-脱附、TG和DSC等手段对复合物进行了表征, 结果表明, 单体N-异丙基丙烯酰胺(NIPAAm)在介孔孔内发生了原位聚合, 聚合物PNIPAAm比较均匀地附于孔壁, 含量达24%左右. 这一聚合和孔内填充没有破坏SBA-15的有序六方结构, 但使样品的表面积、孔径、孔容减小. 同时, 这一有机-无机纳米复合物仍然保持PNIPAAm的温度响应性, 最低临界溶解温度(LCST)与纯PNIPAAm相似.

关键词: 温敏纳米复合物, 聚N-异丙基丙烯酰胺(PNIPAAm), 介孔材料, SBA-15, 制备, 表征

A novel thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm)/mesoporous silica SBA-15 nanocomposite has been prepared via an in situ polymerization initiated by a radical. The nanocomposite was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption, thermogravimetric analysis and differential scanning calorimetry. It was confirmed that the polymerization of monomer NIPAAm occurred within the channels of SBA-15 and a coating layer of the polymer was formed along the pore walls with a relatively uniform distribution. The content of polymer in the composite by TG analysis is about 24%. The polymerization and pore filling did not destroy the ordered hexagonal structure of SBA-15; but the surface area, the pore size and the pore volume of the composite were decreased due to the introduction of the polymer. Moreover, the thermo-sensitive property of PNIPAAm was retained in the nanocomposite, which had a lower critical solution temperature similar to that of pure PNIPAAm.

Key words: thermo-sensitive nanocomposite, poly(N-isopropylacrylamide), mesoporous material, SBA-15, preparation, characterization