Water Structure Change-Induced Expansion and Collapse of Zwitterionic Polymers Surface-Grafted onto Carbon Black
Yiwen Pei A B , Jadranka Travas-Sejdic A and David E. Williams A C
+ Author Affiliations
- Author Affiliations
A MacDiarmid Institute for Advanced Materials and Nanotechnology, and Polymer Electronics Research Centre, School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand.
B Current address: Centre for Advanced Macromolecular Design, School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia.
C Corresponding author. Email: david.williams@auckland.ac.nz
Australian Journal of Chemistry 67(11) 1706-1709 https://doi.org/10.1071/CH14301
Submitted: 14 May 2014 Accepted: 12 July 2014 Published: 29 September 2014
Abstract
We demonstrate the expansion and collapse of surface-grafted zwitterionic polymer brushes in water caused by the addition of urea. We hypothesize that at low urea concentrations, this is an effect of an ion–dipole interaction between urea and the polymer, and at high urea concentrations, an effect of a change in water structure causing change in solvation of the brushes and hence a change in the dipole–dipole interaction, and that it is analogous to the effects of urea on protein stability.
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