反相悬浮聚合诱导微米级多孔SiO2微球的制备

以硅溶胶为硅源,采用聚丙烯酰胺作为结构导向试剂,反相悬浮聚合法制备了介孔二氧化硅微球。控制引发剂过硫酸钾、交联剂N,N-亚甲基双丙烯酰与单体丙烯酰胺的加入量,获得球形度以及分散性较佳的聚丙烯酰胺复合二氧化硅微球。焙烧去除聚丙烯酰胺模板后得到的二氧化硅微球通过光学显微镜、红外光谱FT-IR、X-射线衍射以及氮气吸附脱附等手段进行了表征,证明聚丙烯酰胺在制备中起到了良好的结构导向作用,获得的二氧化硅微球的比表面积为240m2/g,孔径均匀分布于9nm左右,孔容度为0.3cm3/g。该方法可以通过改变转速的方法控制硅球的粒径。

INVERSE SUSPENSION POLYMERIZATION INDUCED PREPARATION OF MICRON-SIZED POROUS SIO2 SPHERES

The mesoporous silica spheres were synthesized with inverse suspension polymerization method using silica sol as silicon source,polyacrylamide(PAM) as structure direct agent.PAM@SiO2 composite spheres with good dispersibility and sphericity were obtained in the condition of 2.80g monomer added and the molar ratio of cross linker: monomer at 1:10.PAM template was removed by calcination at 600℃.Particle size analysis,FT-IR,XRD and BET techniques were used to characterize the product,whose results proved that PAM performed as a good structure agent,the silica spheres have a specific surface area of 240m2/g,pore volume of 0.3cm3/g and pore size evenly distributed at 9 nm.Particle size of the spheres could be controlled by changing stirring speed.