【摘要】 用微乳液聚合法制备了粒径均匀的聚苯乙烯-丙烯酸高分子微球P（St-co-AA）,与共沉淀法所制纳米Fe₃O₄通过静电作用,使两种微球自组装成高磁含量的磁性微球[Fe₃O₄/P（St-co-AA）].采用XRD,TEM、SEM、IR等对样品进行表征,采用VSM对样品进行磁性能测试.结果表明P（St-co-AA）平均粒径约为70nm,表面含有羧基;所得磁粉为Fe₃O₄单相,平均粒径约为10nm.磁性能测试表明,当外加磁场为1.5×10⁶/π（A/m）时,磁化强度达到饱和,饱和磁化强度为69A·m²·kg^-1;自组装所制高分子磁性微球为球形,平均粒径约800nm,磁粉含量为15.8%.研究表明,pH值、搅拌等对复合磁性微球的形成有重要影响.更多还原

【Abstract】 Uniform P（St-co-AA） microspheres were prepared by microemulsion polymerization.The Fe₃O₄/P（St-co-AA） mierospheres with a high magnetic content were prepared by electrostatic self- assembly using P（St-co-AA） microspheres with Fe₃O₄ nanoparticles synthesized by co-precipitation. The effects of pH,stirring on the preparation of Fe₃O₄/P （St-co-AA） were investigated.All samples were characterized by transmission electron microscope （TEM）,scanning electron microscope（SEM）, X-ray diffraction（XRD）,FTIR spectroscope.The magnetic property of the obtained magnetic powder with Fe₃O₄ single phase was tested by VSM.The results indicate that the average sizes of polymer microspheres P（St-co-AA） with carboxyl and the magnetic powders Fe₃O₄ are 70nm and 10nm,re- spectively.Magnetic property measurement shows that the saturated magnetization of the magnetic powders is 69A.m²·kg^-1 when the applied field is up to 1.5×10⁶/π（A/m） at room temperature.The assembled Fe₃O₄/P（St-co-AA） with an average size of 800nm is spherical and the content of magnetic powders is 15.8%.更多还原