The inclusion complex ofβ-cyclodextrin (β-CD) and sulfurized isobutylene (T321) was prepared with a co-precipitation method. The tribological properties of the complex with different concentrations were investigated by a four-ball tester in the solution of polyethylene glycol-600 (PEG-600). The experimental results suggest that the complex exhibits better anti-friction and anti-wear properties thanβ-CD under different load conditions. The tribo-system shows the least friction coefifcient when the concentration of the complex is 0.8%. During the friction process, the complex was decomposed into various molecular fragments and the T321 molecules were released onto the friction interface to provide effective lubrication. The XPS analytical results on the worn surfaces reveal that sulifde iflm formed by the released T321 plays a major role, and the iron alkoxide and carbon deposition iflms formed by theβ-CD fragments have better anti-friction effect on the sulifde iflm surface. The interactions of different iflms result in the formation of a mixed boundary lubrication iflm.
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