Abstract
Styrene-based polymer films synthesized in a hydrocarbon plasma were investigated using mass spectrometry. The structure of the film was determined by analysing the molecular species emitted after pyrolysis at various temperatures. It was found that the film consisted mainly of polystyrene, to which hydrocarbon molecules of low molecular weight were attached, with graphite insertions. Some free radicals from the plasma were chemically stabilized in the polymer matrix and caused oxidation of the film in air. An investigation of the oxidation kinetics using mass spectrometry showed that the greatest contribution came from oxidation of the polyethylene fraction, non-polymerized ethylene and free carbon. The first of these processes caused degradation of the film.
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