Plates of polyethylene with ultrahigh molecular weight (PEUHMW) were treated by radiofrequency capacitive CF4 plasma discharge in order to incorporate fluorinated functional groups. The consequences of subsequent heating treatments after fluorination were investigated by the combined use of angle-resolved XPS characterizations and measurements of surface free energy γs . The temperature range explored covers the zone from room temperature to 240 °C. After the CF4 plasma treatments, the incorporation of CF x groups at the surface of PEUHMW induces a decrease of the γs value. Further thermal treatments lead to modifications of the chemical surface composition and of γ s . The most important changes concern a significant increase of the surface free energy, where the contribution of the dispersive component is the most affected, and a decrease of the F/C ratio. The fluorine departure is caused by chain scission in the polymer and is accompanied by a surface oxidation, as revealed by the O 1s peak intensity increase.
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Jama et al. (1999) studied this question.
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