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Decoupling Dynamics and Crosslink Stability in Supramolecular Hydrogels Using Associative Exchange.

Pierre Le Bourdonnec1, Charafeddine Ferkous1, Léo Comunale1

  • 1Laboratoire Charles Coulomb, CNRS, Université de Montpellier, Montpellier, France.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

This study introduces DNA-based supramolecular hydrogels with associative crosslink exchange, enhancing mechanical robustness and dynamic reconfigurability. These adaptive soft materials offer resilience and responsiveness by decoupling network relaxation from crosslink stability.

Keywords:
DNA hydrogelsassociative reorganizationsrelaxationsrheologyrupture mechanicssupramolecular networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Designing hydrogels with both mechanical strength and dynamic reconfigurability is challenging.
  • High crosslink dissociation rates often compromise hydrogel network integrity.
  • Existing dynamic hydrogels face limitations in balancing responsiveness and robustness.

Purpose of the Study:

  • To develop DNA-based supramolecular hydrogels with decoupled mechanical robustness and dynamic reconfigurability.
  • To investigate associative crosslink exchange as a mechanism for enhanced hydrogel properties.
  • To engineer adaptive soft materials with tunable relaxation timescales.

Main Methods:

  • Enzyme-synthesized single-stranded DNA self-assembly via hybridization.
  • Incorporation of associative crosslink exchange (strand displacement) and dissociative melting.
  • Rheological measurements and thermodynamic modeling to analyze network behavior.
  • Characterization of stress dissipation, rupture strength, and thermal stability.

Main Results:

  • Achieved tunable relaxation timescales spanning over three orders of magnitude.
  • Demonstrated that associative exchange enhances stress dissipation without compromising mechanical strength or thermal stability.
  • Showcased decoupling of network relaxation from crosslink stability, unlike weakening in purely dissociative systems.
  • Implemented a catalytic reorganization pathway controlled by sample composition.

Conclusions:

  • Associative crosslink exchange is a viable strategy for creating robust yet reconfigurable hydrogels.
  • The mechanism of reorganization is a critical design parameter for adaptive soft materials.
  • These hydrogels offer a promising platform for resilient and responsive material applications.