Redox-controlled upper critical solution temperature behaviour of a nitroxide containing polymer in alcohol-water mixtures

Bertrand, Olivier;Vlad, Alexandru;Hoogenboom, Richard;Gohy, Jean-François
(2016) Polymer Chemistry — Vol. 7, n° 5, p. 1088-1095 (2016)

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Research on stimuli responsive polymers builds momentum as nature-inspired applications using man-made materials are increasingly sought. Here, we show for the first time the thermo-responsive upper critical solution temperature (UCST) behaviour of a nitroxide containing polymer based on (2,6,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO). It is demonstrated that poly(TEMPO methacrylate) (PTMA) exhibits a UCST-type cloud point temperature in alcohol-water mixtures that can be tuned by an external electrical stimuli. To exemplify this, we studied the UCST behaviour of this polymer in alcohol-water mixtures. The reversible redox response of PTMA is used to tune the thermo-responsive behaviour of the solvated polymer. The effect of the oxidation extent in PTMA on UCST is demonstrated and a correlation between the chemical and electrochemical oxidation routes is presented.
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Bertrand, O., Vlad, A., Hoogenboom, R., & Gohy, J.-F. (2016). Redox-controlled upper critical solution temperature behaviour of a nitroxide containing polymer in alcohol-water mixtures. Polymer Chemistry, 7(5), 1088-1095. https://doi.org/10.1039/C5PY01864A (Original work published 2016)