功能型磁性聚合物微球的制备与表征

以油酸修饰的Fe3O4为磁核,以苯乙烯、丙烯酸为单体,采用细乳液聚合制备了含羧基功能基团的聚(苯乙烯-丙烯酸)共聚物微球.对修饰后的Fe3O4粒子和聚合物微球进行了XRD、FT-IR和TGA表征,并结合振动扫描样品测试(VSM)对修饰效果和磁性能进行分析.采用SEM、TEM对粒子形态进行了表征,并讨论了丙烯酸用量、助稳定剂和Fe3O4用量对粒子形态的影响.结果表明,当丙烯酸、助稳定剂和Fe3O4用量分别为单体总量的10%、8%和15%时,得到的聚合物微球结构规整,但磁性高.

Preparation and Characterization of Functional Magnetic Polymer Microspheres

Carboxyl functionalized poly（styrene-acrylic acid）microspheres were prepared by miniemulsion polymerization,in which Fe3O4 nanoparticles modified by oleic acid were used as the magnetic cores.The modified Fe3O4 particles and magnetic polymer microspheres were characterized by XRD,FT-IR and TGA.The magnetic properties were also measured by vibrating sample magnetometer （VSM）.The morphology of the particles was observed by SEM and TEM.The effects of the amount of acrylic acid,costabilizer and Fe3O4 nanoparticles on the morphology of the composite particles were discussed.The result shows that the magnetic composite particles with regular spherical shape and superparamagnetism are obtained when the amount of acrylic acid,costabilizer and Fe3O4 nanoparticles are 10％,8％ and 15％ of the total amount of monomers,respectively.