【摘要】 本工作使用的四氧化三钴纳米颗粒经由水热法合成,使用油酸对颗粒表面进行修饰。采用苯乙烯(St)、十二烷基硫酸钠(SDS)和十六醇(CA)配成的乳液体系,添加四氧化三钴纳米颗粒(OA-NP),利用γ射线辐照引发单体聚合,制备出具有中空结构的聚合物-纳米颗粒复合物。复合物产物的电镜照片显示改变SDS、OA-NP的用量可控制样品的形貌及尺寸。苯乙烯单体聚合动力学研究发现,OA-NP对聚合有阻聚作用。在聚合早期,纳米复合物球壳上出现"大孔"结构,随着聚合时间增加"大孔"有逐渐闭合的趋势。据此,推测了复合物中空结构的可能形成机理。四氧化三钴纳米颗粒与复合物的磁性能比较表明,聚合物包覆可对四氧化三钴纳米颗粒的软磁特性产生影响。更多还原

【Abstract】 Polymer-nanoparticles composites with hollow structure were prepared by emulsion polymerization with Co3O4 nanoparticles(OA-NP) added into emulsion system containing styrene(St),sodium dodecyl sulfate(SDS) and cetyl alcohol(CA) under irradiation using γ-rays.Co3O4 nanoparticles were synthesized by hydrothermal method at first,and then modified with oleic acid(OA).The influence factors such as dosage of OA-NP and SDS on mor-phology and size distribution of hollow spheres were thoroughly studied.OA-NP was proved to inhibit the polymeri-zation of St in the kinetic studies.It was found that pores occurred on hollow spheres’ shell at the first stage of reac-tion,and then the perfect shells formed gradually with polymerized time.The mechanism for the hollow spheres for-mation was proposed based on the obtained results.The soft magnetic properties of Co3O4 nanoparticles were influ-enced directly by polystyrene.更多还原