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Fe_3O_4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-methacryloxypropyltrimethoxy 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),thermogravimetric 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.
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