模板沉积法制备大孔高比表面积Fe3O4/P( GMA-co-EGDMA)磁性复合微球

摘要

A simple method for preparation of Fe3O4/P ( GMA-co-EGDMA) magnetic composite microspheres using microporous P(GMA-co-EGDMA) microspheres copolymerized with glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA) as template is reported in this paper. The preparation process included soaking of ferrous ion and ferric ion and coprecipitation in the presence of OH" . The influences of soaking temperature, soaking time, coprecipitation temperature and deposition times on magnetic content of magnetic composite microspheres were studied. The optimum preparation process of microporous Fe3O4/P (GMA-co-EGDMA) magnetic composite microspheres was as follows: microporous P (GMA-co-EGDMA) microspheres were soaked at 50°Cfor 4 h, coprecipitation temperature and time were 70°C and 1 h respectively. The magnetic content of magnetic composite microsphereswas 45. 24% when the deposition process was repeated 4 times. The morphology, magnetic properties, magnetic content, pore performance and particle size distribution of Fe3O4/P (GMA-co-EGDMA) were determined by SEM, TGA, XRD, mercury porosimeter and laser particle sizer. It was found that the range of particle size of Fe3O4/P (GMA-co-EGDMA) was 100~200 jmm and average particle size was 162 j^m, specific saturation magnetization was 10. 92 emu ? G~J , average pore diameter and specific surface area were 60 nm and 116 m2 ? G"1 respectively.%介绍了一种以大孔高比表面积甲基丙烯酸缩水甘油酯(GMA)与二甲基丙烯酸乙二醇酯(EGDMA)共聚交联微球[P(GMA-co-EGDMA)]为模板制备磁性复合微球的简单方法.制备过程包括Fe3+和Fe2+的浸入、OH-作用下孔内铁离子的共沉淀两步.在此过程中考察了浸泡温度、浸泡时间、共沉淀温度以及沉积次数对微球磁含量的影响,确定最佳制备工艺为50℃浸泡4h,70℃反应1h,如此反复4次磁含量可以达到45.24％.并通过SEM、VSM、XRD、TGA及压汞仪、激光粒度仪等手段对Fe3O4/P( GMA-co EGDMA)的形貌、比饱和磁化强度、磁含量及孔性能进行了表征,微球的粒径范围处于100～200 μm之间,平均粒径为162 μm,比饱和磁化强度为10.92 emu·g-1,平均孔径及比表面积分别为60 nm和116 m2·g-1.