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Reichelt, S. ; Eichhorn, K.-J. ; Gohs, U. ; Simon, F. ; Fleischmann, S. ; Voit, B.
Immobilization of a hyperbranched polyester via grafting-to and electron beam irradiation

Stable thin films of an aromatic-aliphatic hyperbranched polyester with hydroxyl groups were fabricated on silicon substrates using electron beam irradiation and a grafting-to approach. We present a detailed study on the influence of the dose, dose rate, and temperature on the film properties and degradation behavior of the polyester immobilized by electron beam irradiation. A patterned polyester film was prepared on the substrate using a masking technique. In the second part of this work, we report on a method for the strong binding of the hyperbranched polyester onto the surface of an “activated” silicon substrate without using any coupling agent. The results are compared with the grafting-to of the hydroxyl-terminated polyester using thin PGMA anchoring layers (Reichelt et al. Macromol. Symp. 2007, 254, 240-247). The optimal conditions and mechanism of the anchoring procedures were investigated. The surface and film properties of all immobilized polymer films were characterized by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), electrokinetic measurements, contact-angle measurements by drop-shape analysis, spectroscopic and imaging ellipsometry, and infrared spectroscopy. It is shown that all immobilization methods can be optimized in such a way that the polymer surface properties remain unchanged compared to those of nongrafted polyesters.

Quelle
Langmuir 24

Seiten
9392-9400

DOI
http://dx.doi.org/10.1021/la8006662

Erschienen am
September 2008
 
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