Volume 64, Number 3, November 2003
|Page(s)||378 - 384|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Growth of a dense polymer brush layer from solution
Institut für Angewandte Physikalische Chemie, Universität Heidelberg Im Neuenheimer Feld 253, D-Heidelberg, Germany
2 Department of Physics and Atmospheric Science, Dalhousie University Halifax, N.S. B3H 3J5 Canada
Accepted: 27 August 2003
The chemical grafting of alkanethiol-terminated poly(ethylene glycol) to a gold substrate from dimethylformamide solution was monitored by in situ ellipsometry for several molar concentrations. In the initial stage a layer of mushroom-like moieties forms and, on a much longer time scale, is followed by conformational conversion (and further adsorption) to a dense brush of stretched polymers. A statistical mechanical theory is presented that allows for a nonuniform grafting density and conformational conversion. It accounts fully for all observed details.
PACS: 68.43.De – Statistical mechanics of adsorbates / 68.43.Mn – Adsorption/desorption kinetics / 82.35.Gh – Polymers on surfaces; adhesion
© EDP Sciences, 2003
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