高Fe_3O_4含量单分散P(St/AA)复合微球的合成与表征  

PREPARATION AND CHARACTERIZATION OF MONODISPERSE P(St/AA) COMPOSITE MICROSPHERES WITH HIGH Fe_3O_4 CONTENT

作　　者：贺枰[1] 崔陇兰[1] 强伟丽[1] 徐宏[1] 古宏晨[1] 

机构地区：[1]上海交通大学微纳科学技术研究院微米/纳米加工技术国家重点实验室薄膜与微细技术教育部重点实验室,上海200030

出　　处：《高分子学报》2007年第8期731-736,共6页Acta Polymerica Sinica

基　　金：国家高技术研究发展计划(863计划;项目号2006AA032359);上海市纳米专项基金(基金号0652nm012;05DZ19312)资助项目

摘　　要：在表面由十一烯酸和油酸共同修饰的Fe3O4磁流体存在下,以苯乙烯(St)和丙烯酸(AA)为共聚单体,用细乳液聚合法,制备了单分散,高Fe3O4含量,且表面带有羧基的超顺磁性高分子复合微球.采用透射电镜(TEM),热重分析(TGA),物性测量系统(PPMS),Zeta电位以及红外光谱等手段对磁性复合微球的各项性能进行表征.结果表明,Fe3O4粒子的表面改性是影响复合微球Fe3O4含量及形貌的关键因素.在优化的实验条件下,可以制得Fe3O4含量高达77wt%,平均粒径为137·9nm,表面羧基密度0·0894mmol/g,比饱和磁化强度为44·7emu/g的单分散超顺磁性高分子复合微球.Monodisperse carboxylated superparamagnetic polymer composite microspheres with high magnetite content were prepared by miniemulsion copolymerzation, in which acrylic acid and styrene were used as polymeric monomers, and Fe3 O4 microparticles were costabilized by undecylenic acid/oleic acid. Extensive characterizations by transmission electron microscopy （TEM）, Zeta-sizer, thermogravimetric analysis （TGA）, fourier transform infrared spectrometer （FTIR） and physical property meaturement system （PPMS） showed that the surface modification of Fe3O4 microparticles played an important role in controlling the magnetite content and the morphology of the composite microspheres. Under optimized experimental conditions, the superparamagnetic polymer composite microspheres with diameter of 137.9 nm,high magnetite content （77 wt%） and 0.0894 mmol carboxyl groups/g microspheres were successfully produced.

关 键 词：细乳液 超顺磁性 复合微球 羧基 表面改性 

分 类 号：TQ316.334[化学工程—高聚物工业]