title: Recognition-Mediated Hydrogel Swelling Controlled by Interaction with a Negative Thermoresponsive LCST Polymer.
abstract: Most polymeric thermoresponsive hydrogels contract upon heating beyond the lower critical solution temperature (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 macrocyclic host CBPQT4+, swelling occurred as a result of host-guest complex formation leading to charge repulsion between the host units, as well 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 pseudorotaxane 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.
authors.affiliation: Unité des Matériaux et Transformations, UMR CNRS 8207, ENSCL, Equipe Ingénierie des Systèmes Polymères (ISP), 59655, Villeneuve O'Ascq Cedex, France.
authors.forename: Khaled
authors.initials: K
authors.lastname: Belal
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Equipe: chimie des polymères F-, 75252, Paris Cedex 05, France.
authors.forename: François
authors.initials: F
authors.lastname: Stoffelbach
authors.affiliation: Unité des Matériaux et Transformations, UMR CNRS 8207, ENSCL, Equipe Ingénierie des Systèmes Polymères (ISP), 59655, Villeneuve O'Ascq Cedex, France.
authors.forename: Joël
authors.initials: J
authors.lastname: Lyskawa
authors.affiliation: ESPCI ParisTech (PSL Research University) and UPMC Univ. Paris 06 (Sorbonne Universités), Sciences et Ingénierie de la Matière Molle (CNRS UMR 7615), 10 Rue Vauquelin, 75005, Paris, France.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Fumagalli
authors.affiliation: ESPCI ParisTech (PSL Research University) and UPMC Univ. Paris 06 (Sorbonne Universités), Sciences et Ingénierie de la Matière Molle (CNRS UMR 7615), 10 Rue Vauquelin, 75005, Paris, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Hourdet
authors.affiliation: ESPCI ParisTech (PSL Research University) and UPMC Univ. Paris 06 (Sorbonne Universités), Sciences et Ingénierie de la Matière Molle (CNRS UMR 7615), 10 Rue Vauquelin, 75005, Paris, France.
authors.forename: Alba
authors.initials: A
authors.lastname: Marcellan
authors.affiliation: Unité des Matériaux et Transformations, UMR CNRS 8207, ENSCL, Equipe Ingénierie des Systèmes Polymères (ISP), 59655, Villeneuve O'Ascq Cedex, France.|Supramolecular Chemistry Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4-bis, 9000, Ghent, Belgium.
authors.forename: Lieselot De
authors.initials: L
authors.lastname: Smet
authors.affiliation: Supramolecular Chemistry Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4-bis, 9000, Ghent, Belgium.
authors.forename: Victor R
authors.initials: VR
authors.lastname: de la Rosa
authors.affiliation: WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK. graeme.cooke@glasgow.ac.uk.
authors.forename: Graeme
authors.initials: G
authors.lastname: Cooke
authors.affiliation: Supramolecular Chemistry Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4-bis, 9000, Ghent, Belgium. Richard.hoogenboom@ugent.be.
authors.forename: Richard
authors.identifier: 0000-0001-7398-2058
authors.initials: R
authors.lastname: Hoogenboom
authors.affiliation: Unité des Matériaux et Transformations, UMR CNRS 8207, ENSCL, Equipe Ingénierie des Systèmes Polymères (ISP), 59655, Villeneuve O'Ascq Cedex, France. patrice.woisel@ensc-lille.fr.
authors.forename: Patrice
authors.initials: P
authors.lastname: Woisel
keywords: host-guest compounds; hydrogels; supramolecular chemistry; swelling; thermoresponsive polymers