Fe_3O_4/聚苯乙烯-丙烯酸磁性微球的制备与表征

Preparation and characterization of P(St-AA)magnetic microspheres

在Fe3O4磁流体存在下进行双层表面活性剂改性,采用改进的乳液聚合法制备了以苯乙烯和丙烯酸的共聚物为壳的磁性高分子微球。在扫描电镜下观察磁性微球的粒径为250nm左右;通过红外光谱(FT-IR)、XRD、热重分析等手段表征了磁性微球的组成成分、结构的变化以及Fe3O4磁性含量。实验表明,在优化的实验条件下,可以制得磁含量高达32%的磁性复合微球。

Magnetic polymer microspheres were prepared by advanced mulsion polymerization,in which styrene and acrylic acid were used as polymetic monomers,and microparticles were modified by two surfactants.Scanning electron microscope（SEM）,fourier transform infrared spectrometer（FT-IR）,X-ray diffraction（XRD）,thermogravimetric analysis（TGA）were used to examine the composition,the chang of structure and the content of Fe3O4.The results showed that under optimized experimental conditions the microspheres with 0.25μm and high magnetic content（32%）were produced.