PS／pAPBA核-壳微球的制备和表征

Preparation and Characterization of PS/pAPBA Core-Shell Microspheres

在水溶液中以间氨基苯硼酸为单体,过硫酸铵作引发剂,将聚间氨基苯硼酸聚合在用悬浮法制备的平均粒径为55μm的聚苯乙烯微球表面,形成了聚苯乙烯/间氨基苯硼酸核-壳结构的微球。用扫描电子显微镜、氮气吸附/脱附、X射线光电子能谱和拉曼光谱等测试技术对微球进行了结构表征。结果表明,聚间氨基苯硼酸通过苯环之间的电子配对相互作用,包覆在聚苯乙烯微球表面形成核-壳结构微球;壳层薄膜具有中微孔结构,平均孔径为30.2 nm,核-壳微球的BET比表面积为193.26 m2/g。

Polystyrene microspheres with an average diameter of 55 μm were prepared by suspension polymerization via oxidation of the monomer by ammonium persulfate. Poly-3-aminophenylboronic acid was grafted onto the surfaces of the polystyrene microspheres to form polystyrene/poly-3-aminophenylboronic acid core- shell micospheres. The samples were characterized with scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption/desorption method. The results show that poly-3- aminophenylboronic acid was successfully grafted to the surfaces of the polystyrene microspheres by aromatic ring electron-pairing interaction, and that the surfaces of the core-shell microspheres possessed porous structure, with the average pore diameter of 30. 2 nm and the BET surface area of 193.26 m^2/g.