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

Geoghegan, M.; Ruiz-Pérez, L.; Dang, C. C.; Parnell, A. J.; Martin, S. J.; Howse, J. R.; Jones, R. A. L.; Golestanian, R.; Topham, P. D.; Crook, C. J.; Ryan, A. J.; Sivia, D. S.; Webster, J. R. P.; Menelle, A.

doi:10.1039/b611847j

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

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Golestanian, R.
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Geoghegan, M., Ruiz-Pérez, L., Dang, C. C., Parnell, A. J., Martin, S. J., Howse, J. R., et al. (2006). The pH-induced swelling and collapse of a polybase brush synthesized by atom transfer radical polymerization. Soft Matter, 2(12), 1076-1080. doi:10.1039/b611847j.

Cite as: https://hdl.handle.net/21.11116/0000-0001-A6F7-D

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. © The Royal Society of Chemistry.