Synthesis and swelling behavior of a weak polyacid brush

We describe the synthesis and the swelling behavior of a weak polyacid brush attached to a solid surface. Monolayers of poly methacrylic acid are generated by using self-assembled monolayers of an azo initiator and radical chain polymerization of methacrylic acid monomer at the surface of a planar s...

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Bibliographic Details
Published in:The Journal of chemical physics 2002-09, Vol.117 (10), p.4988-4994
Main Authors: Biesalski, M., Johannsmann, D., Rühe, J.
Format: Article
Language:English
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Summary:We describe the synthesis and the swelling behavior of a weak polyacid brush attached to a solid surface. Monolayers of poly methacrylic acid are generated by using self-assembled monolayers of an azo initiator and radical chain polymerization of methacrylic acid monomer at the surface of a planar substrate in situ. The thickness of the resulting surface-attached polyelectrolyte brush can be adjusted between 5 and 400 nm in the dry, collapsed state. The swelling behavior in water as a function of pH and salt concentration is investigated by multiple-angle null-ellipsometry. At high salt concentrations the brush thickness decreases due to electrostatic screening. At low concentration, however, an increase of thickness with ion concentration is found.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1490924