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- Adhesion promoting interlayers (1)
- Chemical conversion of functional groups (1)
- Copolymers (1)
- Metal-polymer interactions (1)
- Metal-polymer systems (1)
- Oxygen low-pressure plasma treatment of polymers (1)
- Peel strength (1)
- Plasma modification (1)
- Plasma polymers with functional groups (1)
- Polyethylene (1)
- Polypropylene (1)
- Spacers (1)
- r.f. pulsed plasma (1)
The chemical and morphological stabilities of polymer segments in the near-surface layer were investigated by spectroscopic methods such as X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. Model studies were undertaken with LangmuirBlodgett films, self-assembled monolayers and oligomer films. For thin polymer layers (30 to 500 nm), the changes in molecular-weight distributions of some polymers were investigated systematically by size exclusion chromatography, matrix-assisted laser desorption/ionizationtime-of-flight mass spectrometry and thermal-field flow fractionation for oxygen- and helium-plasma exposures. The polymer surfaces were found to be relatively stable at exposure to an oxygen low-pressure plasma up to ca. 2 s. This is important information to get maximum adhesion to metals in composites. In correlation to their redox potentials, potassium, aluminium and chromium react with oxygen functional groups at the polymer/metal interface. In a dedicated study, chromium was found to attack aromatic rings and form different reaction products.