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Thickness Transition of a Rigid Supramolecular Polymer

Laurent Bouteiller 1 Olivier Colombani 1 Frédéric Lortie 2 Pierre Terech 3
1 LCP - Chimie des polymères
UPMC - Université Pierre et Marie Curie - Paris 6, IPCM - Institut Parisien de Chimie Moléculaire, CNRS - Centre National de la Recherche Scientifique : UMR7610
Abstract : A low molecular weight bisurea in nonpolar solvents is shown to self-assemble by hydrogen bonding into two distinct high molecular weight structures. At low temperature and high concentration, the most stable structure is a thick cylindrical assembly, responsible for the very high viscosity of the solution. At higher temperature or lower concentration, the thick filaments disappear in favor of thinner filaments, leading to a lower viscosity. The reversible transition occurs over a temperature range of 5 °C only, showing that it is highly cooperative. The structural switch can also be triggered by changing the nature of the solvent or the composition in the case of a mixture of two bisureas. The high cooperativity and the tunability of this transition are useful for the design of responsive materials.
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Laurent Bouteiller, Olivier Colombani, Frédéric Lortie, Pierre Terech. Thickness Transition of a Rigid Supramolecular Polymer. Journal of the American Chemical Society, American Chemical Society, 2005, 127 (24), pp.8893--8898. ⟨10.1021/ja0511016⟩. ⟨hal-01696741⟩

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