中文摘要：

通过分散聚合法制备了单分散性好,粒径均一的聚苯乙烯（PS）微球.以PS微球为核,用浓硫酸进行表面改性,使其表面带有负电.加入一定量的[Ag（NH3）2]＋溶液,由于静电吸引,使其吸附在PS微球表面,通过化学还原的方法制备了PS/Ag核/壳结构复合微球.采用透射电镜（TEM）、扫描电镜（SEM）、红外光谱（IR）、X射线衍射（XRD）以及紫外-可见光谱对PS/Ag复合微球进行表征.结果表明：通过PS微球的表面改性,在其表面引入了磺酸基团,提高了微球表面的电负性和亲水性,对包覆过程起到了很好的促进作用;通过稳定剂（PVP）和不同还原剂（一缩二乙二醇DEG和乙二醇EG）的使用,形成的PS/Ag核/壳复合微球形貌不一样,同时研究表明制备出的PS/Ag复合微球可以用于催化剂催化还原有机染料溶液,表现出很好的催化活性.

英文摘要：

Monodisperse and uniform polystyrene （PS） mierospheres are prepared by dispersion poly- merization. PS microspheres are modified by concentrated sulfuric acid which can make them with negative charges. Adding a certain amount of [Ag（NHa）2]＋ solution, [Ag（NHa ）2]＋ ions are ad- sorbed onto the surface of the PS microspheres via electrostatic attraction, then PS/Ag core/shell composite microspheres are prepared through the method chemical reduction. The morphology, uni- formity and structural properties of PS microspheres and PS/Ag core/shell composite microspheres are characterized and analyzed via transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, infrared spectroscopy （IR） and X-ray diffraction （XRD）. The results show ： -SO3 H groups are grafted on the surface of the PS microspheres via surface modification, which improves the electro- negativity and hydrophilieity of the microspheres and plays a good role in promoting the cladding process; it can result in synthesizing different morphology of PS/Ag core/shell composite micro- spheres through using stabilizer （PVP） and different reducing agents （diethylene glycol DEG, ethyl- ene glycol EG）.