采用分步法制备了聚苯乙烯／银（PS／Ag）核壳结构复合纳米球。首先采用无皂乳液聚合法并利用丙烯酸（AA）的羧基对制备的PS球进行改性，使其表面带负电荷；然后通过静电吸附作用在改性PS球的表面沉积[Ag（NH3）2]^＋,水浴（80℃）环境中利用十二烷基磺酸钠（SDS）作为还原剂将PS球表面的[Ag（NH3）2]^＋还原，制备出PS／Ag核壳结构复合球。通过动态激光粒度分析仪和透射电子显微镜对PS／Ag核壳纳米球的粒度分布、形貌和结构进行了表征，研究了AA的用量对复合球粒径及包覆的Ag壳厚度的影响。结果表明，随着AA用量的增大，所包覆的银层更加致密，厚度增大，当AA用量为15％时可得到Ag完全包覆的PS／Ag复合纳米球。
The core-shell PS/Ag composite nanospheres were synthesized via the method o亿 fractional steps. Firstly, the highly monodisperse PS nanospheres were prepared by taking the emulsifier-free emulsion polymerization approach, and the carboxyl group of acrylic acid was used to modify their surfaces to be surrounded with negative charges. Secondly, [Ag（NH3）2]^＋ was deposited on the modified surfaces of PS nanospheres and then was reduced with the SDS as the reducing agent in the water bath environment （80℃） so as to obtain the PS/Ag core-shell composite nanospheres. The particle size distribution, morphology and structure of the prepared core- shell PS/Ag composite nanospheres were chacacterized by using the dynamic light scattering and transmission election microscope. The influence of AA amount on the core-shell PS/Ag composite particle size and the coat of Ag shell thickness were investigated. It show that the Ag coating became more compact and thicker with the increase of AA amount. When AA came to 15%, the PS/Ag composite nanospheres with completely coated Ag were obtained.
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