XPS analyses of polystyrene thin films treated under DC pulsed discharges conditions in nitrogen, oxygen and oxygen-argon mixtures

摘要: This paper is devoted to polystyrene thin film treatment under DC pulsed discharges in nitrogen, oxygen and oxygen-argon mixtures. XPS analysis used order investigate the new chemical bonds generated by reactive particles colliding surface from plasma. The experimental conditions are close best running deduced [16, 75, 86]. Correlations between microscopic analyses obtained through knowledge of composition macroscopic ones realized studies water drop deposited on films (contact angle measurements) presented. It pointed out that wettability highly improved when percentage atoms incorporated reaches a high value. C - O, = O main it found uptake happens during very short time (about one second for duration time, i.e. about 10 ms account duty factor value). A rate observed, correlated formation maximum Δθ/θi plateau value (wettability). Reaction processes plasma bulk proposed, taking into bond energies polystyrene. As consequence, interpreted assuming two steps reaction processes: first step, broken energy transfer generated. In this spirit, described reactions proposed surface.