蔗糖/水体系磁性聚苯乙烯微球的制备及其表征

Preparation and characterization of magnetic polystyrene microspheres in sucrose aqueous solution as disperse medium

以氧化法制备Fe3O4磁流体，首次采用蔗糖水溶液为分散介质，以聚乙烯醇为稳定剂，偶氮二异丁腈为引发剂，悬浮聚合法合成了磁性聚苯乙烯微球。该蔗糖水反应体系对环境无污染且后处理简单。考察了蔗糖、苯乙烯（St）、Fe3O4磁流体、稳定剂、引发剂的含量等条件对微球的粒径及其分布的影响。所合成的磁性聚苯乙烯微球具有核壳型结构，有较强的磁响应性能，球形和分散度良好，粒径为80-85μm。采用红外光谱、振动样品磁强计和光学显微镜对磁性聚苯乙烯微球进行了表征。

Fe3O4 magnetic fluid were prepared by precipitation-oxidation method. Magnetic polystyrene micro spheres were prepared successfully via suspension copolymerization in sucrose aqueous solution dispersie medium for the first time, using poly（vinyl alcohol）（PVA） as stabilizer and 2,2-azo-bisisobutyronitrile（AIBN） as initiator. The sucrosewater reaction system is simple post-processing and pollution-free to the environment. The effects of content of sucrose in sucrose aqueous solution, styrene（St）, initiator（AIBN）, stabilizer（PVA） on particle size and distribution of magnetic poiystyrene microspheres were investigated. The synthetic magnetic polystyrene microspheres with core-shell structure had a stronger response to the magnetic properties. And the size of microspheres with good pattern and dispersion ranges from 80μm to 85μm. FTIR, VSM and optical microscope were used to characterize the size, component and magnetic property of the obtained mierospheres.