核-壳结构磁性复合微球的制备与表征  

Preparation and characterization of magnetic composite microspheres with core-shell structure

作　　者：任琦 周璇 倪忠斌 熊万斌 陈明清 

机构地区：[1]江南大学化学与材料工程学院,无锡214122

出　　处：《化工新型材料》2009年第12期23-25,共3页New Chemical Materials

基　　金：国家自然科学基金(20671043);江苏高等学校科技创新团队(苏教科[2007]5号)资助项目

摘　　要：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）-co-polyacrylonitrile-co-polystyrene （PAA-co-PAN-co-PSt） microspheres were prepared by dispersion copolymerization of acrylic acid, acrylonitrile and styrene using polyvinylpyrrolidone （PVP） as stabilizer. The diameter of the PAA-co-PAN-co-PSt microspheres was controlled in range of 230 to 680 nm by adjusting ratio of ethanol to water and amount of stabilizer PVP. Fe3O4 nanoparticles were synthesized through adjusting pH of reaction system in the presence of Fe （Ⅱ/Ⅲ） salt and deposited on surfaces of the PAA-co-PAN-co PSt microspheres by chemical coprecipitation. The finally formed magnetic composite microspheres had a core-shell structure, which with PAA-co-PAN-co PSt as core and Fe3O4 as shell. The Fe3O4 content of the magnetic composite microspheres was reached to 41% based on the analysis of TGA. The composite microspheres obvious had magnetic response under magnetic field.

关 键 词：分散共聚 FE3O4纳米颗粒 磁性复合微球 响应 

分 类 号：O631.3[理学—高分子化学]