Programmable Polymer‐Based Supramolecular Temperature Sensor with a Memory Function |
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Authors: | Léna Sambe Victor R de?La?Rosa Khaled Belal Dr François Stoffelbach Dr Joel Lyskawa Dr François Delattre Marc Bria Prof Graeme Cooke Prof Richard Hoogenboom Prof Patrice Woisel |
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Institution: | 1. Université Lille Nord de France, ENSCL, Unité des Matériaux et Transformations, UMR CNRS 8207, Equipe Ingénierie des Systèmes Polymères (ISP), 59655 Villeneuve d'Ascq Cedex (France);2. Supramolecular Chemistry Group, Department of Organic Chemistry, Ghent University, Krijgslaan 281‐S4, 9000 Ghent (Belgium);3. Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM, Chimie des Polymères, 75005 Paris (France);4. UCEIV, EA 4492, Université du Littoral C?te d'Opale, Av. M. Schuman, 59140 Dunkerque (France);5. Glasgow Centre for Physical Organic Chemistry, WestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ (UK) |
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Abstract: | A new class of polymeric thermometers with a memory function is reported that is based on the supramolecular host–guest interactions of poly(N‐isopropylacrylamide) (PNIPAM) with side‐chain naphthalene guest moieties and the tetracationic macrocycle cyclobis(paraquat‐p‐phenylene) (CBPQT4+) as the host. This supramolecular thermometer exhibits a memory function for the thermal history of the solution, which arises from the large hysteresis of the thermoresponsive LCST phase transition (LCST=lower critical solution temperature). This hysteresis is based on the formation of a metastable soluble state that consists of the PNIPAM–CBPQT4+ host–guest complex. When heated above the transition temperature, the polymer collapses, and the host–guest interactions are disrupted, making the polymer more hydrophobic and less soluble in water. Aside from providing fundamental insights into the kinetic control of supramolecular assemblies, the developed thermometer with a memory function might find use in applications spanning the physical and biological sciences. |
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Keywords: | host– guest systems memory phase transitions supramolecular chemistry thermometer |
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