Authors Tusek, L. ; Nitschke, M. ; Werner, C. ; Stana-Kleinschek, K. ; Ribitsch, V.
Title Surface characterization of NH3 plasma treated polyamide 6 foils
Date 26.10.2001
Number 9544
Abstract Nitrogen-containing plasmas are widely used to improve wettability, printability, bondability, and biocompatibility of polymer surfaces. Plasma-treatments fed with NH<sub>3</sub> give rise to N-functionalities, such as amino (---NH<sub>2</sub>), imino (---CH=NH), cyano (---C<img src="" alt="6-point triple bond; length half of m-dash" border=0>N) and others on polymers, plus oxygen-containing groups due to post-plasma atmospheric oxidation. This work deals with NH<sub>3</sub> plasma treatment of PA 6 foils and the evaluation of surface modification as a function of treatment time. The introduced functionalities were observed by streaming potential measurements (surface charge), X-ray photoelectron spectroscopy analysis (nature of introduced functionalities), atomic force microscopy (surface topography), and contact angle measurement (assessment of treatment effect). The results show that the introduction of N-containing groups is increasing with longer treatment time only to a certain extent where the negative effect of surface destruction prevails over the positive effect of introduction of functional groups. The treatment causes a shift of the isoelectric point (IEP) toward pH of 6.2 as compared to 4.2 found for the untreated foil. If the treatment time is longer than 1 min the IEP is shifted to lower pH, the number of amino groups on the surface is reduced and the contact angle is increased.
Publisher Colloids and Surfaces A: Physicochemical and Engineering Aspects
Citation Colloids and Surfaces A: Physicochemical and Engineering Aspects 195 (2001) 81-95
Tags MBC_Plasma

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