Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 29: POSTER: Polymer physics
CPP 29.14: Poster
Tuesday, March 8, 2005, 16:30–18:30, Poster TU D
Heating of Elastomer Surfaces after Plasma Fluorination — •T. Meyer — Universiät Osnabrüeck, Fachbereich Physik, Barbarastr. 7, D-49069 Osnabrück, Germany
For many industrial applications, i.e. in the printing-industrie, hydrophobic HNBR-Elastomer surfaces are necessary. In this work the thermal stability of these surfaces will be investigated. HNBR (Hydrated Nitril Butadien Rubber) was treated by a 2.45 GHz microwave CF4-Plasma in order to incorporate fluorinated functional groups. The consequences of subsequent heating treatments after fluorination were investigated by a combination of angle-resolved XPS and measurements of the surface free energy (contact angle γs ), over a temperature range from 100∘C to 240∘C. After the CF4 plasma treatments, the incorporation of CFx groups at the surface of HNBR induces a decrease of the γs value. Further thermal treatments lead to modifications of the chemical surface composition and of γs. 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 Fluor/Carbon ratio. The loss of fluorine is caused by chain scission in the polymer and is accompanied by a surface oxidation, as revealed by an increasing O 1s XPS-peak intensity.