Abstract: With oleic acid functionalized Fe₃O₄ nanoparticles as the magnetic carriers, styrene and crylic acid as the monomers, and divinylbe nzene (DVB) as cross linker, the magnetic polystyrene microspheres were prepared by disperse polymerization. A series of characterizations show that asprepared magnetic polystyrene microspheres have narrower size distribution with smooth surface, fine morphology and structure. The asprepared microspheres are pretty superparamagnetic, the specific saturation magnetization of them reaches to 11.61 Am2/kg at room temperature.

Key words: magnetic microsphere, disperse polymerization, preparation, superparamagnetic