Erforschung von Systemloesungen fuer transparente Verschleissschutzschichten auf Kunststoffen fuer die Optik. Teilvorhaben: Untersuchung der Strukturen und Eigenschaften von Verschleissschutzschichten fuer die Optik Abschlussbericht

Optical coatings on plastics were studied for improving scratch resistance and reducing water absorption. The surfaces of optical lenses made from poly(bisphenol-A-carbonate), poltmethylmethacrylate, poly[diethylenglycol-bis(allylcarbonate)] and polyurethane without and with additional protective coatings (SiO_2, polysiloxanes, borosilicate) were characterized concerning surface hardness, formation of surface defects upon moisture absorption and water permeability of the optical coatings. The moisture content was determined by analyzing transmission spectra in the near infrared (NIR), surface topography was characterized by Atomic Force Microscopy, surface hardness was measured by a scratching test, and chemical composition of coatings prepared from silicons was studied by IR transmission spectroscopy. NIR spectroscopy is proposed as a standard method for monitoring water permeability of optical coatings on plastics (DE 195 19975). The water barrier effect of coatings strongly depends on the parameters used in the coating process. E.g., the barrier effect of SiO_2 coatings on polycarbonate deposited with plasma ion assisted deposition generally increases with increasing bias voltage. (WEN)Available from TIB Hannover: F97B611+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman