Eingang zum VolltextHome | Suche | Browsen
Bitte beziehen Sie sich beim Zitieren dieses Dokumentes immer auf folgende|
Laschewsky, André ; Ringsdorf, H.
Polymerization of amphiphilic dienes in Langmuir-Blodgett multilayers
Kurzfassung auf EnglischAmphiphilic derivatives of octadiene and docosadiene were investigated in monolayers and Langmuir-Blodgett multilayers, with respect to their self-organization and their polymerization behavior. All amphiphiles investigated form monolayers. However, only acid and alcohol derivatives were able to build up multilayers. Those multilayers are rapidly photopolymerized in the layers via a two-step process: Irradiation with long-wavelength UV light yields soluble polymers, whereas additional irradiation with sfiort-wavelength
UV light produces insoluble and presumably cross-linked polymers. The reaction meclianism is discussed according to the polymer characterization by UV spectroscopy, small-angle X-ray scattering, NMR spectroscopy, and gel permeation chromatography. All multilayers undergo structural changes during the polymerization; substantial changes result in defects in the polymerized layers as observed by scanning electron microscopy.
In contrast to the acids and alcohols, the deposition of monolayers of the aldehyde derivatives did not yield well-ordered multilayers, but rather amorphous films. In this different film structure, the photopolymerization
process differs from the one observed in multilayers.
Home | Leitlinien | Impressum | Haftungsausschluss | Statistik | Universitätsverlag | Universitätsbibliothek