物理化学学报 >> 2003, Vol. 19 >> Issue (11): 1049-1053.doi: 10.3866/PKU.WHXB20031113

研究论文 上一篇    下一篇

聚苯乙烯/Ag核壳结构纳米微粒的制备及表征

段春英;周静芳;吴志申;党鸿辛   

  1. 河南大学,河南省特种功能材料重点实验室,开封　475001
  • 收稿日期:2003-05-07 修回日期:2003-07-10 发布日期:2003-11-15
  • 通讯作者: 周静芳 E-mail:jingfangzhou@hotmail.com

Preparation and Characterization of the Polystyrene/silver Core-shell Structure Nanospheres

Duan Chun-Ying;Zhou Jing-Fang;Wu Zhi-Shen;Dang Hong-Xin   

  1. Key Laboratory of Special Functional Materials, Henan University, Kaifeng　475001
  • Received:2003-05-07 Revised:2003-07-10 Published:2003-11-15
  • Contact: Zhou Jing-Fang E-mail:jingfangzhou@hotmail.com

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摘要： 用种子乳液聚合法合成了聚苯乙烯（PS）/Ag复合纳米粒子,进一步利用分步聚合技术实现了聚甲基丙烯酸甲酯(PMMA)在微球表面功能化,分别用TEM、XRD、TG-DTA及FT-IR对其结构和形貌进行了表征,并考察了其摩擦学性能.结果表明,在所选择的实验条件下,合成了以Ag纳米微粒为核,PS、PMMA为壳层的核壳结构复合纳米微球,其中Ag纳米核平均粒径约12 nm,复合微球粒径约25 nm,颗粒较均匀并且在有机溶剂中有良好的分散性,作为润滑油添加剂,具有良好的抗磨性能.

关键词: PS/Ag, 核壳结构, 乳液聚合, 表面功能化, 摩擦学性能

Abstract: PS/Ag composite microspheres with core-shell structure were prepared by a seeded emulsion polymerization. The surface of PS/Ag microspheres as prepared was functionalized by PMMA. Its morphology and structure were characterized by TEM, XRD, TG, DTA and FT-IR, etc. The results show that Ag nanocore is spherical and its average diameter is about 12 nm. The average diameter of composite microphere is about 25 nm with a narrow size distribution. It is also found that composite nanoparticles can be well dispersed in organic solvent. Their tribological properties as additives in liquid paraffin were investigated with a four-ball tribometer. The results indicate, with the lubrication of liquid paraffin containing PMMA/PS/Ag nanoparticles, the wear-scar diameter is far smaller as compare with pure liquid paraffin. Moreover its maximum non-seizure load is above 1000 N and that of pure liquid paraffin is below 400 N. This shows that composite nanospheres have a good anti-wear performance.

Key words: Polystyrene/silver, Core-shell structure, Emulsion polymerization, 　Surface-functionalization, Tribological properties