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Strain induced clustering in polyelectrolyte hydrogels.

Guillaume Miquelard-Garnier1, Costantino Creton1, Dominique Hourdet1

  • 1Physico-chimie des Polymères et des Milieux Dispersés, UMR 7615, UPMC-CNRS-ESPCI, 10 rue Vauquelin, 75005 Paris, France. costantino.creton@espci.fr dominique.hourdet@espci.fr.

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Large strain compression of polyelectrolyte hydrogels reveals strain-induced ionic clustering. This phenomenon, driven by electrostatic interactions, influences hydrogel mechanical properties like hysteresis and hardening.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biophysics

Background:

  • Polyelectrolyte hydrogels are advanced materials with tunable properties.
  • Understanding their mechanical behavior under large strains is crucial for applications.
  • Existing research often overlooks deformation-induced phenomena in hydrogels.

Purpose of the Study:

  • To investigate the mechanical response of modified poly(acrylic acid) (PAA) hydrogels under large strain compression.
  • To elucidate the underlying mechanisms responsible for observed mechanical behaviors like hysteresis and strain-hardening.
  • To explore the role of electrostatic interactions and ionic clustering in large-strain deformation.

Main Methods:

  • Systematic compression measurements were conducted on polyelectrolyte hydrogels.
  • Modified poly(acrylic acid) (PAA) crosslinked with bifunctional thiols were used.
  • Analysis focused on identifying critical strain values, hysteresis, strain-hardening, and stress plateaus during unloading.

Main Results:

  • Significant hysteresis, strain-hardening, and stress plateaus were observed above a critical strain.
  • These phenomena were attributed to strain-induced ionic clustering driven by electrostatic interactions.
  • The clustering effect was found to be dynamic, reversible, and possess a long lifetime.
  • This is the first report of deformation-induced clustering between like-charge polymer chains in hydrogels.

Conclusions:

  • Deformation can induce ionic clustering in polyelectrolyte hydrogels, significantly altering their mechanical properties.
  • Electrostatic interactions play a critical role in the large-strain behavior of these materials.
  • The findings provide new insights into hydrogel mechanics, relevant for understanding fracture properties and designing advanced materials.