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0.5203cm3/g和较高的比表面积334.5m2/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.
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 polyrnerized 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 nanocompos-ite was investigated. The results showed that when the content of polymer PAA was about 20% ,the nanocom-posite still held a relatively large pore volume(0. 5203cm3/g )and high surface area(334.5m3/g). The polymeri-zation 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.
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