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Article Dans Une Revue Angewandte Chemie International Edition Année : 2016

Recognition-Mediated Hydrogel Swelling Controlled by Interaction with a Negative Thermoresponsive LCST Polymer

Résumé

Most polymeric thermoresponsive hydrogels contract upon heating beyond the lower critical solution temper-ature (LCST) of the polymers used. Herein, we report a supramolecular hydrogel system that shows the opposite temperature dependence. When the non-thermosesponsive hydrogel NaphtGel, containing dialkoxynaphthalene guest molecules,becomes complexed with the tetra cationic macro-cyclic host CBPQT4+, swelling occurred as a result of host–guest complex formation leading to charge repulsion between the host units,aswell as an osmotic contribution of chloride counter-ions embedded in the network. The immersion of NaphtGel in a solution of poly(N-isopropylacrylamide) with tetrathiafulvalene (TTF) end groups complexed with CBPQT4+ induced positive thermoresponsive behaviour. The LCST-induced dethreading of the polymer-based pseudoro-taxane upon heating led to transfer of the CBPQT4+ host and a concomitant swelling of NaphtGel. Subsequent cooling led to reformation of the TTF-based host–guest complexes in solution and contraction of the hydrogel.
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Dates et versions

hal-01440784 , version 1 (26-01-2017)

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Khaled Belal, François Stoffelbach, Joël Lyskawa, Matthieu Fumagalli, Dominique Hourdet, et al.. Recognition-Mediated Hydrogel Swelling Controlled by Interaction with a Negative Thermoresponsive LCST Polymer. Angewandte Chemie International Edition, 2016, 55 (45), pp.13974-13978. ⟨10.1002/anie.201605630⟩. ⟨hal-01440784⟩
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