摘要
采用化学共沉淀法制备了Fe_3O_4纳米颗粒,以PEG-4000为表面活性剂进行表面修饰,制备了分散性良好的纳米Fe_3O_4磁流体。磁流体存在时,采用分散聚合法,以苯乙烯为单体制备了磁性高分子微球。TEM研究表明,Fe_3O_4纳米颗粒的平均粒径约为10nm,分散聚合所制备的磁性聚苯乙烯微球的平均粒径约为80nm;VSM研究表明,合成的Fe_3O_4纳米颗粒及磁性聚苯乙烯微球具有超顺磁性;FT-IR研究表明,Fe_3O_4纳米颗粒很好地包覆于聚苯乙烯中;XRD结果表明,分散聚合前后,Fe_3O_4纳米颗粒的晶体结构没有发生变化。
The Fe3O4 nanoparticles are prepared by the chemical coprecipitation, the well-dispersed Fe3O4 magnetic fluid modified with PEG are synthesized. The magnetic polymer microspheres are prepared by dispersion polymerization using styrene as monomer magnetic fluid. TEM, FTIR, XRD and VSM are used to characterize the size, component, crystal structure and magnetic properties of the as-synthesized microspheres. The results show that the average diameter of magnetic nanoparticles are about 10nm（Fe3O4 ） and 80nm（PS）, respectively. Fe3O4 nanoparticles are well encapsulated in PS and Fe3O4 nanoparticles and magnetic PS microsphere also show superparamagnetic, the crystal structure of Fe3O4 nanoparticles has not change before and after dispersion polymerization.
基金
兰州理工大学科研发展基金(SB01200602)
甘肃省中青年自然科学基金(3YS061-A25-025)
