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Eingeladener Vortrag
- nein (120)
Die Akkreditierung für Prüfverfahren in der Oberflächenanalytik wird gemeinhin als sehr schwierig angesehen. Durch das unlängst eingeführte flexible Konzept der Akkreditierung, auch Prüfartenakkreditierung genannt, eröffnen sich nunmehr neue Möglichkeiten. Aus dem Bereich des Normenwesens in der Oberflächenanalytik erhalten die Prüflaboratorien zusätzliche Unterstützung. Die Validierung von ESCA-Prüfverfahren und ein wohldokumentiertes Prüfmittelmanagement sind weitere Bausteine auf dem Weg zur erfolgreichen Akkreditierung. Oberflächenanalyseverfahren sind akkreditierfähig.
Reactions and Intermediates at the Metal-Polymer Interface - Detected by XPS and NEXAFS Spectroscopy
(1998)
Modelling plasma-induced reactions on polymer surfaces using aliphatic self-assembling and LB layers
(1998)
Different types of plasma, irradiative and chemical activation were compared in terms of surface functionalization. Corona and spark jet plasmas are characterized by low gas temperatures and high rates in surface modification. UV irradiation in the presence of ozone does not involve any particle bombardment and acts only by enhanced photooxidative processes. Although ion implantation can be avoided, this method is not free of radiative damage in both the surface-near region and the bulk of polymers. Furthermore, its functionalization rate is low. In relation to low-pressure O2 plasma modification, all treatments mentioned here have a low efficiency in adhesion promotion due to oxidative degradation of macromolecules and formation of molecular debris known as the ''weak boundary layer''.
Catalyst characterization
(1998)
NEXAFS analysis of a plasma treated, partially crystalline poly(ehtylene terephtalate) surface
(1996)
Barrier properties of plasma and chemically fluorinated polypropylene and polyethyleneterephthalate
(1995)
The functionalization, perfluorination or an coating of polypropylene (PP) and polyethyleneterephthalate (PET) surfaces in different plasma atmospheres and in an F[2] + N[2] gas mixture were investigated. The aim of this work was to form a barrier layer against solvent and fuel permeation. Typical test solvents were n-pentane, toluene, tetrachloroethylene and mixtures of n-pentane and methanol. The permeation was gravimetrically measured. The permeation of the solvent mixtures was analyzed by mass spectrometry and Fourier transform IR spectroscopy. The permeation of the solvent mixtures through the plasma-modified polymer samples was associated with increased absorption of polar solvent components in the polymer film. The thickness of the plasma-fluorinated PP surface layer was 10-100 nm and that of chemically fluorinated PP about 5000 nm. Nearly the same barrier efficiency was measured for both plasma- and chemically fluorinated samples.