【摘要】 采用共沉淀法制备了Fe3O4纳米粒子,用表面硅烷化改性得到分散性良好的纳米Fe3O4磁流体,以苯乙烯(St)、甲基丙烯酸甲酯(MMA)为单体,采用无皂乳液聚合法制备了羧基聚苯乙烯磁性微球。运用红外光谱(FT-IR)、透射电子显微镜(TEM)、X射线衍射(XRD)、振动样品磁强计(VSM)、热失重(TG)等手段,对复合微球的组成成分、形貌及粒径、磁学性能及Fe3O4的含量进行了表征。结果表明,Fe3O4/PS磁性微球粒径均匀,呈比较规整的球形,表面带羧基功能基团,磁响应性能与磁流体用量有关,最高饱和磁化强度为34.1A.m2/kg。更多还原

【Abstract】 The Fe3O4 nanoparticles were prepared by method of coprecipitation,and consequently well dispersed Fe3O4 magnetic fluid modified with silane coupling were synthesized.The carboxyl polystyrene magnetic microspheres were prepared through emulsifier-free emulsion polymerization,employing styrene and methyl methacrylate as monomers.The properties of composite microspheres were characterized by FT-IR,TEM,XRD,VSM and TG etc.The results showed that carboxyl Fe3O4/PS magnetic microspheres were uniform and sphericity.The magnetic responsibility of the composite microspheres is related to the dosage of magnetic fluid.The maximum saturation magnetization is 34.1 A?m2/kg.更多还原