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采用双原位细乳液聚合工艺,将疏水改性的磁性纳米粒子(MNP)加入到细乳液反应体系的油相中,利用增长的聚合物和单体TEOS之间的相分离原理,实现了聚合物的生成和TEOS的水解缩合同步进行,一步获得了磁性SiO2/PSt中空复合微球.通过红外光谱(FTIR)、透射电镜(TEM)、热重差热分析(TGA/DSC)和振动磁强计(VSM)对中空复合微球进行了表征.结果表明,制备的SiO2/PSt中空复合微球的尺寸范围为300～600 nm,当加入磁性纳米粒子后,得到的磁性SiO2/PSt中空微球保持了原来的中空结构,中空复合微球内腔的大小可以通过改变单体TEOS的加入量来控制.SiO2/PSt中空微球对磁性纳米粒子的包封率达到了86%.磁性SiO2/PSt中空复合微球具有超顺磁性,饱和磁强度值为14.7 emu/g.
Using the dual in-situ miniemulsion polymerization process, hydrophobically modified magnetic nanoparticles (MNPs) were added to the oil phase of the miniemulsion reaction system, using the principle of phase separation between the growing polymer and the monomeric TEOS to achieve polymerization The magnetic SiO2 / PSt hollow composite microspheres were obtained in one step, and the formation of magnetic SiO2 / PSt composite hollow microspheres was carried out synchronously. The structure and properties of magnetic SiO2 / PSt composite microspheres were investigated by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), TGA / (VSM) hollow microspheres were characterized.The results showed that the size of the prepared SiO2 / PSt hollow composite microspheres ranged from 300 to 600 nm, and the magnetic SiO2 / PSt hollow microspheres The cavity size of the hollow composite microspheres can be controlled by changing the amount of the TEOS added into the hollow microspheres, and the encapsulation efficiency of the magnetic nanoparticles with SiO2 / PSt hollow microspheres reaches 86%. Magnetic SiO2 / PSt Hollow composite microspheres with superparamagnetism, the saturation magnetic value of 14.7 emu / g.