单分散性大粒径磁性复合微球的制备和表征

The synthesis and characterization of poly(St-DVB-MAA) coated iron oxide microspheres with large diameter and narrow distribution

把聚乙二醇(PEG)和十二烷基磺酸钠(SDS)包裹的自制纳米Fe3O4磁流体加入到分散聚合体系,制备出粒径300～500μm的聚(苯乙烯-二乙烯基苯-甲基丙烯酸)磁性高分子微球并用光学显微镜、红外光谱(FT-IR)、X射线粉末衍射仪(XRD)、振动样品磁强计(VSM)以及热重分析仪(TG)等对其表征。结果表明,其粒径分布均匀,表面光滑且含有羧基,室温比饱和磁化强度达到3.63A·m2/kg,磁流体的包裹率随磁流体用量的增加而增加,最高达到17.07%。

The monodisperse magnetic Fe3O4/poly（styrene-divinylbenzene-methacrylic acid） [Fe3O4/poly（StDVB-MAA）] particles with diameter of 300-500μm were prepared by dispersion polymerization in the presence of a ferrofluid coated with polyethylene glycol（PEG）and sodium dodecyl sulfate（SDS）.The structure of the obtained magnetic particles was characterized by optical microscope,fourizer transform infrared spectroscopy（FT-IR）,vibrating-sample magneto-meter（VSM）,thermogravimetric analysis（TG）and X-ray diffraction（XRD）.A series of characterizations show that the prepared magnetic polystyrene microspheres have narrower size distribution with smooth surface,fine morphology and structure and—COOH.The as-prepared microspheres are pretty superparamagnetic,the specific saturation magnetization of these microspheres reaches to 3.63A·m2/kg at room temperature.TG provided the weight percent of iron oxide,and the maximum value observed was 17.07%.An increase in magnetic content of the [Fe3O4/poly（St-DVB-MAA）] particles was observed when the amount of ferrofluid increased by TG.