Issue 12, 2006
From the journal:

Soft Matter

The pH-induced swelling and collapse of a polybase brush synthesized by atom transfer radical polymerization

Mark Geoghegan,*a   Lorena Ruiz-Pérez,a   Cheen C. Dang,a   Andrew J. Parnell,a   Simon J. Martin,a   Jonathan R. Howse,a   Richard A. L. Jones,a   Ramin Golestanian,a   Paul D. Topham,b   Colin J. Crook,b   Anthony J. Ryan,b   Devinderjit S. Sivia,c   John R. P. Websterc  and  Alain Menelled  

* Corresponding authors

a Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, United Kingdom
E-mail: mark.geoghegan@sheffield.ac.uk

b Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, United Kingdom

c ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, United Kingdom

d Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay, Gif-sur-Yvette Cédex, France

Abstract

We have used neutron reflectometry to characterize the swelling behaviour of brushes of poly[2-(diethyl amino)ethyl methacrylate], a polybase, as a function of pH. The brushes, synthesized by the “grafting from” method of atom transfer radical polymerization, were observed to approximately double their thickness in low pH solutions, although the pKa is shifted to a lower pH than in dilute solution. The composition–depth profile obtained from the reflectometry experiments for the swollen brushes reveals a region depleted in polymer between the substrate and the extended part of the brush.

Graphical abstract: The pH-induced swelling and collapse of a polybase brush synthesized by atom transfer radical polymerization

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Article information

DOI
https://doi.org/10.1039/B611847J
Article type
Paper
Submitted
16 Aug 2006
Accepted
25 Sep 2006
First published
09 Oct 2006

Soft Matter, 2006,2, 1076-1080

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The pH-induced swelling and collapse of a polybase brush synthesized by atom transfer radical polymerization

M. Geoghegan, L. Ruiz-Pérez, C. C. Dang, A. J. Parnell, S. J. Martin, J. R. Howse, R. A. L. Jones, R. Golestanian, P. D. Topham, C. J. Crook, A. J. Ryan, D. S. Sivia, J. R. P. Webster and A. Menelle, Soft Matter, 2006, 2, 1076 DOI: 10.1039/B611847J

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