分散聚合法制备环氧基磁性复合微球

采用化学共沉淀法制备了油酸包覆的Fe3O4磁性纳米粒子，以此为核·采用分散聚合法制备了表面带有环氧基团的Fe3O4／聚甲基丙烯酸缩水甘油酯（PGMA）磁性复合微球，探讨了聚合工艺、聚合条件对甲基丙烯酸缩水甘油酯（GMA）利用效率的影响规律，并用傅立叶变换红外光谱仪（FTIR）、热重分析仪（TGA）、振动样品磁强计（VSM）和扫描电镜（SEM）等对磁性复合微球的结构、磁性能和包覆量进行了表征．采用盐酸一丙酮法测定了磁性复合微球表面环氧基的含量。结果表明，在优化的条件下。GMA利用效率高达61．26％。磁性复合微球具有良好的单分散性·粒径为1～2μm．具有超顺磁性．比饱和磁强度为17．12emu·g^-1。环氧基含量达3．5mmol·g^-1。

Preparation of Epoxy Magnetic Polymer Microspheres by Dispersion Polymerization

Oleic acid-coated Fe3O4 magnetic nanoparticles were prepared by chemical co-precipitation meth- od, and then magnetic polymer microspheres with epoxy group Fe3O4/PGMA were prepared by dispersion poly- merization and the effects of polymerization process and polymerization conditions on GMA utilization efficiency were investigated. Also, the structure and property of magnetic polymer microspheres were characterized by means of Fourier transform infrared spectrometer （FTIR）,thermogravimetric analyzer （TGA）,vibrating sam- ple magnetometer （VSM） and scanning electron microscopy （SEM）. Hydrochloric acid-acetone solution was applied to determine the content of epoxy group. The results showed that under the optimized conditions,GMA utilization efficiency was about 61.26 % and the prepared magnetic polymer microspheres possessed uniform di- ameter and super-paramagnetism,with diameter of 1~2μm,saturation magnetization of 17.12 emu · g^-1 and epoxy group content of 3, 5 mmol · g^-1.