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2008
Conference Paper
Titel
Investigations of plasma-amination of polymer surfaces by dielectric barrier discharges
Abstract
The introduction of amino groups into surfaces of polymers by contact with atmospheric-pressure discharges in nitrogen-containing gases is a relatively simple way to improve interfacial adhesion and to create covalent bonding sites. Possible reaction mechanisms of the amination of LDPE film using dielectric barrier discharges (DBDs) in N-containing process gases are discussed here, based on experimental results of amino-functionalizations performed in the afterglows of DBDs. Most probably reactions involving excited N2 molecules, activating the polymer surface, and ground state nitrogen atmos are the main surface processes in N2 and N2+H2 mixtures. An important parameter in the work presented here was the surface density of primary amino groups, NH2. It was determined using NH2-selective chemical dervatization (CD) combined with quantitative ATR-FTIR spectroscopy. Examples of fields of application for plasmaaminations using DBD as well as results of a novel method to determine the spatial distribution of amino groups on polymer surfaces, quantitative CD SEM-EDX, are presented here.