中文摘要：

在制备超细Fe3O4磁性粒子的基础上，利用可控制自由基聚合DPE法制备出平均粒径为265nm的P（AA-MMA—ST）／Fe3O4磁性复合微球．采用XRD，TGA，FTIR等手段对所制备的磁性复合微球的形态、结构及磁响应性等进行了表征，结果表明用DPE法制备出的磁性复合微球磁含量较高，粒径比较均匀．

英文摘要：

Submicron P（AA-MMA-ST）/Fe3O4 composite microspheres were prepared by DPE method. X-ray powder diffraction （XRD）, thermogravimetric analysis （TGA） and transmission electron microscopy （TEM） were conducted to characterize the magnetite particles and P（AA-MMA-ST）/Fe3O4 composite microspheres. The average size of the composite microspheres is 265 nm and the magnetite content of the composite microspheres is around 20%.