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2009
Conference Paper
Titel
Plasma-based surface animation of polymers at atmospheric pressure
Abstract
Appreciable amino group densities can be generated on polymer surfaces upon contact with atmospheric-pressure gas discharges in nitrogen-containing, virtually oxygen-free gas atmospheres. Dependent on the application requirements, plasma amination can be performed either uniformly over larger areas and polymer foils or sheets, or - using a plasma printing method - selectively on predetermined areas. Direct-pattering polymer surface modification processes are on interest for bio-chemical or -medical applications as well as for polymer electronics. Using an AC corona discharge stabilized by a dielectric barrier, even complex-shaped parts can be plasma-aminated. In the reaction mechanisms of these processes, the interaction of the surfaces with nitrogen molecules in the first excited state, N2 (A), probably plays an important role in the generation of surface radicals which subsequently react with ground state nitrogen atoms, N(4S). A quantitative analysis of the density of amino groups incorporated can be achieved by amino-selective chemical derivatization, followed by FTIR-ATR or, if lateral resolution of about 1 µm is aspired, electron probe microanalysis.
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