聚苯乙烯/银核/壳复合微球的制备及其表征  

Preparation and characterization of polystyrene/silver core/shell composite microspheres

作　　者：陈明月[1] 董丽红[2] 韩明娟[1] 周威[3] 薛兵[3] 彭晓[1] 王济奎[1] 

机构地区：[1]南京工业大学理学院应用化学系,江苏南京211816 [2]通化师范学院化学系,吉林通化134002 [3]北京工商大学理学院化学系,北京100048

出　　处：《分子科学学报》2014年第5期383-389,共7页Journal of Molecular Science

基　　金：国家自然科学基金资助项目(21003074;21103126和21003005);江苏省自然科学基金资助项目(BK20131407)

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.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）.

关 键 词：聚苯乙烯/银 还原剂 稳定剂 催化剂 

分 类 号：O648[理学—物理化学]