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通过分散共聚制得了聚(丙烯酸-丙烯腈-苯乙烯)(PAAS)三元共聚物微球,调整聚合反应介质乙醇与水的体积比及分散剂的用量,可将PAAS微球的粒径控制在230~680nm的范围内;扫描电子显微镜观察发现,所得微球粒径具有较好的单分散性。以该PAAS共聚物微球为载体,在二价和三价铁盐存在的条件下控制体系的pH,经共沉淀将Fe3O4纳米颗粒有效沉积在微球表面,得到了以PAAS为核,Fe3O4为壳的核-壳结构磁性复合微球;热重分析结果表明,复合微球上Fe3O4的含量达41%,对磁场具有明显的响应性。
Poly (acrylic acid - acrylonitrile - styrene) (PAAS) microspheres were prepared by dispersion copolymerization. The volume ratio of ethanol to water and the amount of dispersant in the polymerization medium were adjusted to control the particle size of PAAS microspheres In the range of 230 ~ 680nm; Scanning electron microscopy found that the resulting microspheres have a better monodispersity. The PAAS copolymer microspheres as a carrier, in the presence of divalent and ferric salts to control the pH of the system, the co-precipitation of Fe3O4 nanoparticles deposited on the surface of the microspheres effectively, to PAAS as the core, Fe3O4 Shell structure of the magnetic composite microspheres; thermal gravimetric analysis showed that the composite microspheres Fe4O4 content of 41%, the magnetic field has a significant response.