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Materials 2018, 11(6), 991; https://doi.org/10.3390/ma11060991

Cononsolvency Transition of Polymer Brushes: A Combined Experimental and Theoretical Study

1
Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany
2
Institute of Physical Chemistry of Polymeric Materials, Technische Universität Dresden, 01062 Dresden, Germany
3
Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany
*
Authors to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 1 June 2018 / Accepted: 8 June 2018 / Published: 11 June 2018
(This article belongs to the Special Issue Temperature-Responsive Polymers)
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Abstract

In this study, the cononsolvency transition of poly(N-isopropylacrylamide) (PNiPAAm) brushes in aqueous ethanol mixtures was studied by using Vis-spectroscopic ellipsometry (SE) discussed in conjunction with the adsorption-attraction model. We proved that the cononsolvency transition of PNiPAAm brushes showed features of a volume phase transition, such as a sharp collapse, reaching a maximum decrease in thickness for a very narrow ethanol volume composition range of 15% to 17%. These observations are in agreement with the recently published preferential adsorption model of the cononsolvency effect. View Full-Text
Keywords: cononsolvency; preferential adsorption; polymer brushes; PNiPAAm; ellipsometry cononsolvency; preferential adsorption; polymer brushes; PNiPAAm; ellipsometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yong, H.; Rauch, S.; Eichhorn, K.-J.; Uhlmann, P.; Fery, A.; Sommer, J.-U. Cononsolvency Transition of Polymer Brushes: A Combined Experimental and Theoretical Study. Materials 2018, 11, 991.

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