title: 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.
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Chimie, F-69342 Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Hassan
authors.initials: H
authors.lastname: Srour
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Chimie, F-69342 Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Martien Duvall
authors.initials: MD
authors.lastname: Deffo Ayagou
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Chimie, F-69342 Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Thi Thanh-Tam
authors.initials: TT
authors.lastname: Nguyen
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Taberlet
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Manneville
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Chimie, F-69342 Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Chantal
authors.initials: C
authors.lastname: Andraud
authors.affiliation: Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Chimie, F-69342 Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Cyrille
authors.initials: C
authors.lastname: Monnereau
authors.affiliation: Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France. mathieu.leocmach@univ-lyon1.fr.
authors.forename: Mathieu
authors.identifier: http://orcid.org/0000-0002-4754-8933
authors.initials: M
authors.lastname: Leocmach