Synthesis And Characterization Of Magnetic Polymer Microspheres With Surface Functional Groups

The Fe₃O₄ nanoparticles have been prepared by the chemical precipitationmethod. The Fe₃O₄ nanoparticles are about 10 nm diameter with an average. Wewill modify it by dispersion polymerization. The organic modified magnetitenanoparticles were synthesized by the coprecipitation and surfacemodification with HEMA Characterized by TEM, the ultrafme Fe₃O₄/P(St-HEMA)nanospheres had well dispersion and stabilization in aqueous fluids.The superparamagnetic Fe₃O₄/P(St-HEMA) nanospheres with an average diameterof 1μm were characterized significantly with functional hydroxy groups.Next, The Fe₃O₄ nanoparticles were modified by graft polymerication withMPS and emulsion polymerication. The graft polymerication magneticnanoparticles by the Surface modification with MPS and MMA. Characterizedby TEM,IR,TG,DSC and AFM. The ultrafme Fe₃O₄/(MPS-PMMA) nanospheres hadwell dispersion and stabilization.In aqueous fluids, The superparamagntic Fe₃O₄/(MPS-PMMA) nanosphereswith an average diameter of 20-30nm were characterized significantly withfunctional groups.Compared with dispersion polymerization, the graft polymerication magneticnanoparticles have more dispersion and more stabilization and its diametermore smaller. Thus, it is can be used in many fields, such as biotechnologyand other fields. Finally, the nanofibre with modified oleic acid wereprepared by inversemulision Polymerization. All the polymerizationnanospheres have superparamagnitic.