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Supramolecular control over pH- and temperature-responsive dialkoxynaphthalene-functionalized poly(2-(dimethylamino)ethyl methacrylate) in water

Abstract : In the framework of the development of multi-responsive polymer materials, a well-defined copolymer bearing supramolecular recognition units was designed based on 2-(dimethylamino)ethyl methacrylate (DMAEMA) and a dialkoxynaphthalene-functionalized monomer (NaphtA). The supramolecular host–guest interactions of this P(DMAEMA-co-NaphtA) copolymer with the electron-deficient CBPQT4+, 4Cl- cyclophane host were studied by 1H NMR spectroscopy, UV–Visible spectroscopy and isothermal titration calorimetry (ITC), revealing, a high association constant of 6.5 × 105 M−1 in water. The addition of CBPQT4+, 4Cl- to a colorless solution of the copolymer in water resulted in a purple solution due to the formation of donor–acceptor inclusion complexes, the intensity being directly proportional to the amount of host added. Investigations on the thermoresponsive behavior of the naphthalene-functionalized copolymer highlighted that the cloud point temperature is directly proportional to the amount of CBPQT4+, 4Cl- host added and can simply be programmed within a temperature window from 30 °C to 48 °C by playing with pH. The dethreading process was studied as function of temperature and anionic exchange of the counterions of the CBPQT4+, 4Cl-. Interestingly, a partial decomplexation was observed by heating the sample above the cloud point temperature while a complete and programmable dethreading was achieved by adding the anionic surfactant sodium dodecyl sulfate (SDS) as a competitive counterion of the host molecule.
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https://hal.univ-lille.fr/hal-03198707
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Soumis le : jeudi 15 avril 2021 - 09:20:22
Dernière modification le : vendredi 15 octobre 2021 - 13:41:38

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Fanny Coumes, Gaëlle Le Fer, Aurélie Malfait, Richard Hoogenboom, David Fournier, et al.. Supramolecular control over pH- and temperature-responsive dialkoxynaphthalene-functionalized poly(2-(dimethylamino)ethyl methacrylate) in water. European Polymer Journal, Elsevier, 2021, European Polymer Journal, 148, pp.110366. ⟨10.1016/j.eurpolymj.2021.110366⟩. ⟨hal-03198707⟩

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