Untersuchungen zur Plasmaätzung von Polymeren. VI. Veränderungen an der Oberfläche von Polypropylen

Abstract

Bei der Behandlung von Polypropylenfolien im NH3‐Plasma trat nach photoelektronenspektroskopischen Untersuchungen bis mindestens 50 min Behandlungszeit keine Sättigung der Konzentration an N‐haltigen funktionellen Gruppen an der Polymeroberfläche ein. Bei den speziell gewählten Plasmabedingungen kann auf das Vorliegen von NH2‐Gruppen geschlossen werden. Strukturelle Veränderungen in tieferliegenden Schichten traten kaum auf. Durch O2‐Plasmabehandlung wurde die Folienoberfläche stark aufgerauht. Die Ätztruktur entsprach einem überwiegend monoaxial gereckten Polymer.

Significance of Hydrogen–Deuterium Exchange at Polyolefin Surfaces on Exposure to Ammonia Low-Pressure Plasma

“…Moreover, the N-introduction using the NH 3 -plasma (maximal ca. 20% N/C) [26] was much lower than that in the N 2 -plasma (40% N/C) [39][40][41]. Significant percentages of (undesired, post-plasma) oxygen introduction were also found (ca.…”

“…Fig. 1 as also obtained for NH 3 plasma exposure of PP in the past [26]. Its characteristic time-dependence is similar to that of oxygen incorporation by exposure to the O 2 plasma [51,52].…”

“…It is to note that the yield in primary amino group formation in plasmas of ammonia, nitrogen or nitrogen-hydrogen mixtures is lower than 10% of all inserted nitrogen components [7,8]. Therefore, this amination reaction is only a side-reaction.…”

“…Significant percentages of (undesired, post-plasma) oxygen introduction were also found (ca. 10% O/C) [26,42].…”

“…A broad variety of papers were published recently with the topic of ammonia plasma treatment of hydrocarbon polymers [11,[26][27][28][29][30][31][32][33][34][35][36][37][38]. Common conclusion is that the introduction of primary amino groups is only minimal, a broad variety of N-functional groups is formed and a strong post-plasma oxidation occurs.…”