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Scaling laws for the swelling of neutral and charged polymer brushes in good solvents

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Biesalski,  M.
MPI for Polymer Research, Max Planck Society;

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Rühe,  Jürgen
MPI for Polymer Research, Max Planck Society;

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Citation

Biesalski, M., & Rühe, J. (2002). Scaling laws for the swelling of neutral and charged polymer brushes in good solvents. Macromolecules, 35(2), 499-507.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-66A7-F
Abstract
We compare the swelling of surface-attached neutral poly(4- vinylpyridine) (PVP) and charged poly(N-methyl-4- vinylpyridinium iodide) (MePVP) brushes under good solvent conditions using multiple-angle null ellipsometry. The polymer layers were prepared by the "grafting from" technique, where a low molecular mass initiator is self-assembled on the substrate and the polymer brush is grown in situ by free radical chain polymerization. The positively charged MePVP brush was generated from a neutral PVP brush by a polymer-analogous quaternization reaction. As predicted by mean-field theory, the thickness of the neutral swollen brush (PVP) increases with graft density whereas the thickness of the highly charged polyelectrolyte (MePVP) brush in pure water ("salt-free") is almost independent of the graft density.