Abstract: Remarkable improvement of some properties(e.g. oil resistant, friction coefficient)of nitrile butadiene rubber(NBR)was observed after surface fluorination by XeF₂. The surface structure of the fluorinated NBR has been studied by XPS and the carbon 1S peaks have been measured mathematically by curve fitting technique. The results showed that with the increase of fluorinating time the H atoms on the surface of NBR are substituted by F atoms, resulting gradually —CH₂—CHF—CH₂— 、 —CHF—CH₂—CHF— and —CHF—CHF—CHF— groups. The SEM photographs showed about 8～9 μm thickness of the fluorinated surface of NBR.

Key words: nitrile-butadiene rubber, fluorination, surface modification