不同孔径SBA-15内甲基丙烯酸甲酯的反向原子转移自由基溶液聚合  

Solution Polymerization of Methyl Methacrylate in the Channels of SBA-15 with Various Pore Sizes by Reverse Atom Transfer Radical Polymerization

作　　者：覃兰媚 周泓望 张发爱[1] Lanmei Qin;Hongwang Zhou;Fa’ai Zhang(College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学材料科学工程学院

出　　处：《高分子材料科学与工程》2019年第11期23-28,34,共7页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21664005)

摘　　要：用不同孔径的介孔材料SBA-15作为"微反应器",在其孔道内进行甲基丙烯酸甲酯(MMA)的反向原子转移自由基聚合反应(RATRP)。分别通过氮气吸附/脱附、X射线粉末衍射和透射电镜表征了介孔材料和产物的孔参数、晶体结构和形态;采用热重分析、差示扫描量热、凝胶渗透色谱、核磁共振等手段对所得产物在介孔材料中的含量、玻璃化转变温度(T_g)、相对分子质量和立体规整度进行了测试表征。结果表明,MMA在不同孔径介孔材料SBA-15孔道内成功进行了RATRP;聚合后的复合材料保持了介孔材料SBA-15的结构,比表面积、孔体积均有所下降。随着SBA-15的孔径增加,内部所得聚合物的数均相对分子质量最大增加1.25倍,T_g最大升高了18.4℃,间规立构比例逐渐上升。Methyl methacrylate(MMA) was polymerized with different pore sizes of SBA-15 as microreactor by reverse atom transfer radical polymerization(RATRP). The pore parameters, crystal structures and morphologies of the mesoporous materials and obtained products were characterized by nitrogen adsorption test, X-ray powder diffraction(XRD), transmission electron microscopy(TEM), respectively;the thermogravimetry analysis(TGA), differential scanning calorimetry(DSC), gel permeation chromatography(GPC), and hydrogen nuclear magnetic resonance(~1H-NMR) were applied to determine the amounts of the polymers in SBA-15, glass transition temperature(T_g), molecular weight, and stereoscopic degree of the polymers. The results suggest that MMA is polymerized successfully in the channels of SBA-15 with different pore sizes. The mesoporous structures of the PMMA/SBA-15 composites are maintained, but the specific surface area and pore volume decrease. The molecular weight of the inner polymers is increased with the pore sizes of SBA-15, more than 1.25 times in number average molecular weight is reached, and T_g increases 18.4 ℃ at most, and the syndiotactic ratios of PMMA are improved gradually.

关 键 词：介孔材料 SBA-15 反向原子转移自由基聚合 甲基丙烯酸甲酯 受限作用 

分 类 号：TB383[一般工业技术—材料科学与工程]