Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (11): 1049-1053.doi: 10.3866/PKU.WHXB20031113

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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

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