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Mussel byssus cuticle-inspired ultrastiff and stretchable triple-crosslinked hydrogels.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomimetic Materials

Background:

  • Harsh environment applications demand hydrogels with exceptional stiffness, toughness, and stretchability.
  • A significant challenge in hydrogel development is the trade-off between stiffness and extensibility, limiting performance.
  • Mussel byssus cuticle's hierarchical crosslinking structure offers inspiration for advanced material design.

Purpose of the Study:

  • To engineer a hydrogel with ultra-stiffness, toughness, and stretchability.
  • To overcome the inherent stiffness-extensibility trade-off in conventional hydrogels.
  • To mimic the hierarchical crosslinking strategy of mussel byssus cuticle for enhanced mechanical properties.

Main Methods:

  • Fabrication of a triple-crosslinked (TC) hydrogel using chemical crosslinkers, tannic acid (TA), and metal ions.
  • Formation of a hydrogen-bond-based network between polymer and TA for extensibility and energy dissipation.
  • Creation of stiff domains via coordinate bonds between TA and metal ions.

Main Results:

  • The TC hydrogel achieved a two-orders-of-magnitude increase in stiffness (E = 58 MPa) compared to metal-free hydrogels (E = 0.18 MPa).
  • The maximum elongation of the TC hydrogel (ε = 850%) was maintained, comparable to metal-free hydrogels (ε = 860%).
  • Mechanical properties were tunable by varying catechol-metal coordination, demonstrating control over bonding strengths.

Conclusions:

  • A hierarchical triple-crosslinked network effectively combines ultra-stiffness, toughness, and stretchability in hydrogels.
  • The biomimetic approach, leveraging hydrogen bonding and coordination bonding, successfully addresses the stiffness-extensibility trade-off.
  • This strategy offers a pathway for designing advanced hydrogels for demanding applications.