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Citation: Duan Chun-Ying, Zhou Jing-Fang, Wu Zhi-Shen, Dang Hong-Xin. Preparation and Characterization of the Polystyrene/silver Core-shell Structure Nanospheres[J]. Acta Physico-Chimica Sinica, ;2003, 19(11): 1049-1053. doi: 10.3866/PKU.WHXB20031113 shu

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

1.
Key Laboratory of Special Functional Materials, Henan University, Kaifeng　475001

Received Date: 7 May 2003
Available Online: 15 November 2003

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 od anti-wear performance.
- Polystyrene/silver;Core-shell structure;Emulsion polymerization;　Surface-functionalization;Tribological properties
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