The Preparation And Application Of Magnetic Polymer Composite Microspheres

Magnetic polymer composite microspheres have become the hot point of research in the field of nanocomposite in recent years.Magnetic polymer composite microspheres with diffferent functional groups were prepared by a novel phase inversion method in this paper.Preparation technology and the influence factors of Fe₃O₄/P(St-BA/AA)magnetic composite microspheres,Fe₃O₄/P(St-BA)magnetic composite microspheres and Fe₃O₄/P(St-HEA)magnetic composite microspheres were mainly studied.The structure and properties of magnetic composite microspheres were characterized though TEM,XRD,SEM,TGA and laser particle size analyzer.Fe₃O₄ nanoparticles were prepared by co-precipitation method.Oleic acid and KH-570 were introduced on the surface of Fe₃O₄ nanoparticles,respectively.Changes of light transmittance over time of different drying degree OA-Fe₃O₄ nanoparticles in mixed monomer was investigated.The results showed that the mass ratio of OA-Fe₃O₄ nanoparticles and absolute ethyl alcohol were 1:4.455,OA-Fe₃O₄ nanoparticles dispersity in monomers can reach optimum.Changes of light transmittance over time of Fe₃O₄ nanoparticles modified by different amount of KH-570 in mixed monomers was also investigated.The results showed that KH-570-modified Fe₃O₄ magnetic nanoparticles disperisity in mixed monomer can reach optimum when KH-570 concentration was 7g/L.XRD illustrated that Fe₃O₄ nanoparticles had a typical inverse spinel structure,.The intensity of diffraction peaks of Fe₃O₄ nanoparticles modified with OA or KH-570 reduced.The characteristic peaks of KH-570 appeared in the FT-IR spectrum of KH-570 modified Fe₃O₄ nanoparticles.The T_g value of polymer with different mass ratio of monomers were calculated to determine the mass ratio of the monomers.The Fe₃O₄/ P(St-BA/AA)magnetic composite microspheres were prepared with the mass ratio of St:AA:BA of 9:2:1.The Fe₃O₄/P(St-BA)magnetic composite microspheres were prepared with the mass ratio of St:BA of 10:2.The Fe₃O₄/P(St-HEA)magnetic composite microspheres were prepared with the mass ratio of St:BA of 9:3.The electrical conductivity change of phase inverse process in magnetic polymer composite microspheres were studied.The results showed that the electrical conductivity increased quickly during phase inverse occurred.Subsequently,the electrical conductivity decreased slowly,that meant phase inverse process were completed.Magnetic polymer composite microspheres had good magnetic responsibility.XRD,TEM,SEM and TGA indicated that Fe₃O₄ nanoparticles were encapsulated in magnetic polymer composite microspheres.The BSA absorptional preformance of magnetic polymer composite microspheres was studied.The BSA absorptional rate of magnetic polymer composite microspheres with different functional group was compared with the BSA absorptional rate of pure polystyrene composite microspheres.The results showed that,the BSA absorptional rate of magnetic polymer composite microspheres were higher than the BSA absorptional rate of pure polystyrene composite microspheres,due to the additional of different functional groups.