摘要
用化学共沉淀法合成了Fe3O4纳米微粒,并用双层表面活性剂对其进行表面修饰,得到了以水和乙醇为分散介质的磁流体。在磁流体的存在下,用改进的乳液聚合方法合成了Fe3O4/聚苯乙烯磁性微球。X射线衍射研究表明,Fe3O4纳米微粒的平均粒径约为10 nm;在透射电镜下观察磁性微球的粒径在140 nm左右;并用红外光谱和热失重方法表征了复合微球的化学成分及其所含Fe3O4的百分数。阐述了双层表面活性剂改性的机理,并对聚合过程中单体、磁流体及引发剂的用量的影响进行了讨论。
Fe3O4 magnetic nanoparticles were synthesized by the chemical co-precipitation and modified by bilayer surfactants. Then the ferrofluid that dispersed in water and ethanol was obtained. In the presence of ferrofluid, Fe3O4/polystyrene microspheres were obtained by modified emulsion polymerization. The average size of the Fe3O4 magnetic nanoparticles is about 10 nm by XRD; And the size of magnetic microspheres is about 140 nm by TEM; Further more FT-IR and TGA were used to character rize the compontent and magnetic percentage. The mechanism of bilayer surfactants that modified Fe3O4 magnetic nanoparticles was expatiated and the influence of monomer, ferrofluid and initiator in the process of polymerization was discussed.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第3期137-140,共4页
Polymer Materials Science & Engineering
关键词
FE3O4
聚苯乙烯
磁性微球
乳液聚合
Fe3O4
polystyrene
magnetic microspheres
emulsion polymerization
