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Autor

  • Friedrich, Jörg Florian (3)
  • Kühn, Gerhard (3)
  • Weidner, Steffen (2)
  • Decker, Renate (1)
  • Erdmann, Jessica (1)
  • Ghode, Archana (1)
  • Koprinarov, Ivaylo (1)
  • Lippitz, Andreas (1)
  • Möller, B. (1)
  • Schulz, Ulrich (1)
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Erscheinungsjahr

  • 1999 (3) (entfernen)

Sprache

  • Englisch (2)
  • Deutsch (1)

Schlagworte

  • Attenuated total reflectance-Fourier transorm infrared spectroscopy (1)
  • Chemical reduction of functional groups (1)
  • Plasma modification (1)
  • X-ray photoelectron spectroscopy (1)

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Selective surface functionalization of polyolefins by plasma treatment followed by chemical reduction (1999)
Kühn, Gerhard ; Weidner, Steffen ; Decker, Renate ; Ghode, Archana ; Friedrich, Jörg Florian
Polymer surfaces can be finished with functional groups upon exposure to a plasma. Species of the plasma gas are attached at surface carbon atoms, forming functional groups of different composition. To produce a modified polymer surface with a high density and homogeneity of hydroxyl groups only, the oxygen-plasma-formed oxygen functional groups were chemically reduced by diborane and LiAlH4 with yields of 10 to 11 OH groups per 100 carbon atoms in the 3 to 5 nm near-surface layer as detected by X-ray photoelectron spectroscopy (XPS). The identification of hydroxyl groups was performed by means of attenuated total reflectance–Fourier transform infrared spectroscopy and XPS.
Chemical reactions at polymer surfaces interacting with a gas plasma or with metal atoms - their relevance to adhesion (1999)
Friedrich, Jörg Florian ; Unger, Wolfgang ; Lippitz, Andreas ; Koprinarov, Ivaylo ; Kühn, Gerhard ; Weidner, Steffen ; Vogel, Lydia
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 Langmuir–Blodgett 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/ionization–time-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.
Glanzerhaltung von Autolacken - Verbessern der Lebensdauer eines 2K-Klarlacks durch Gasphasen-Fluorierung (1999)
Friedrich, Jörg Florian ; Schulz, Ulrich ; Kühn, Gerhard ; Erdmann, Jessica ; Möller, B.
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