悬浮聚合法制备聚苯乙烯磁性微球

Preparation of PS Magnetic Microspheres Via Suspension Polymerization

本文以聚乙烯醇/水为介质,苯乙烯为单体,在经3-甲基丙烯酰氧基丙基三甲氧基硅烷(3-MPS)表面修饰的Fe3O4磁性颗粒的存在下,采用悬浮聚合法,制备了聚苯乙烯磁性微球。分别用X-射线衍射(XRD)、原子力显微镜(AFM)、热重分析(TGA)、傅里叶变换红外光谱仪(FTIR)、振动样品磁力计(VSM)等方法对磁性微球的结构和性能进行了表征。实验结果表明,所合成的磁性微球为球型结构,平均粒径约为2μm,尺寸分布较均匀,具有超顺磁性。

Polystyrene-coated magnetite（PS/Fe_3O_4） micro-spheres were prepared by grafting styrene onto the surfaces of dispersed magnetite nanoparticles which were modified with 3-methacryloxypropyl-trimethoxy silane（3-MPS） to improve their affinity with monomer,via a free radical suspension polymerization initiated by benzoyl peroxide（BPO）,in the solution of polyvinyl alcohol/H_2O.The obtained microspheres were characterized by means of X-ray diffractometry（XRD）, atomic force microscopy（AFM）,thermo-gravimetric analysis（TGA）,Fourier transform infrared spectroscopy（FTIR）,and vibrating sample magnetometry（VSM）.The results have showed that resulted PS/Fe_3O_4 particles were spherical with a narrow size distribution,a mean diameter of 2μm,and surperparamagnetism.