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Robust biopolymer based ionic-covalent entanglement hydrogels with reversible mechanical behaviour.

Damian M Kirchmajer1, Marc In Het Panhuis

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This study presents a robust biopolymer hydrogel for advanced applications. Optimized ionic-covalent networks demonstrate superior mechanical strength and energy recovery, suitable for soft robotics and tissue engineering.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Materials Engineering

Background:

  • Hydrogels are crucial for emerging fields like soft robotics and cartilage tissue scaffolds.
  • Enhanced mechanical performance is a key requirement for these advanced hydrogel applications.
  • Existing hydrogels often lack the necessary strength and durability for demanding uses.

Purpose of the Study:

  • To develop a robust biopolymer-based hydrogel with enhanced mechanical properties.
  • To investigate the formation of an ionic-covalent entanglement network using gellan gum and gelatin.
  • To optimize hydrogel composition for superior performance in soft robotics and tissue engineering.

Main Methods:

  • Synthesized hydrogels using calcium cross-linked gellan gum and genipin cross-linked gelatin.
  • Systematically varied polymer ratios and cross-linker concentrations.
  • Characterized mechanical properties (compressive fracture stress, work of extension), swelling behavior, pH sensitivity, and homogeneity.

Main Results:

  • Optimized hydrogels achieved compressive fracture stress up to 1.1 ± 0.2 MPa and work of extension up to 230 ± 40 kJ m⁻³.
  • Achieved high swelling ratios (37.4 ± 0.6) with controlled leachage.
  • Demonstrated significant energy dissipation recovery (95 ± 2% and 82 ± 7%) after reloading at 37 °C.

Conclusions:

  • A novel robust biopolymer hydrogel with an ionic-covalent entanglement network was successfully developed.
  • The hydrogel exhibits excellent mechanical strength, tunable swelling, and remarkable energy recovery.
  • This material shows significant promise for applications in soft robotics and cartilage tissue engineering scaffolds.