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Ion pairing controls rheological properties of "processionary" polyelectrolyte hydrogels

Abstract : We demonstrated recently that polyelectrolytes with cationic moieties along the chain and a single anionic head are able to form physical hydrogels due to the reversible nature of the head-to-body ionic bond. Here we generate a variety of such polyelectrolytes with various cationic moieties and counterion combinations starting from a common polymeric platform. We show that the rheological properties (shear modulus, critical strain) of the final hydrogels can be modulated over three orders of magnitude depending on the cation/anion pair. Our data fit remarkably well within a scaling model involving a supramolecular head-to-tail single file between cross-links, akin to the behaviour of pine-processionary caterpillar. This model allows the quantitative measure of the amount of counterion condensation from standard rheology procedure.
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Submitted on : Monday, September 16, 2019 - 5:01:31 PM
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Hassan Srour, Martien Duvall Deffo Ayagou, Thanh-Tam Nguyen Thi, Nicolas Taberlet, Sebastien Manneville, et al.. Ion pairing controls rheological properties of "processionary" polyelectrolyte hydrogels. Soft Matter, Royal Society of Chemistry, 2016, 12 (48), pp.9749-9758. ⟨10.1039/c6sm02022d⟩. ⟨hal-02289457⟩



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