中文摘要：

通过浸渍吸附的方法将PH值敏感的功能单体-丙烯酸引入到介孔二氧化硅SBA-15的孔道内，经自由基聚合使丙烯酸（AA）在孔道内聚合，成功合成了PH值敏感的SBA-15／聚丙烯酸（PAA）纳米复合材料。所得纳米复合材料的结构通过XRD、TEM、氮气吸附／脱附、TG、FT-IR等手段进行了表征，并进行了pH敏感性能研究。结果表明，当聚合物（PAA）的量达到20％左右时，复合材料仍然具有较大的孔体积0．5203cm^3／g和较高的比表面积334．5m^2／g。聚合反应的发生没有破坏SBA-15的有序介孔结构，这种纳米复合材料初步显示出了PH敏感性。这种具有高比表面的pH值响应介孔纳米复合材料，有望在药物缓释领域得到应用。

英文摘要：

The pH-sensitive mesoporous nanocomposite SBA-15/PAA was synthesized successfully, pH sensitive functional monomer,acrylic acid,were introduced into the channels of SBA-15 via impregnation adsorption, and then polymerized in situ inside the pores of SBA-15. The structure of the nanocomposite was characterized by fourier-transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） ,and N2 adsorption-desorption, thermogravimetric analysis（TG）. The pH sensitivity of the nanocomposite was investigated. The results showed that when the content of polymer PAA was about 20% ,the nanocomposite still held a relatively large pore volume（0. 5203cm^3/g ）and high surface area（334.5m^2/g）. The polymerization did not destroy the ordered mesoporous structure of SBA-15, the nanocomposite displayed pH sensitivity. Therefore,pH-sensitive mesoporous nanocomposite thus prepared is expected to have potential applications in drug release.