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Beyond Cartilage-Inspired Supramolecular Polyurethane for Adaptive Impact-Resistant Protection with Robustness,

Rou-Han Lai1, Chia-An Chiu1, Yi-An Chen1

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Researchers developed a novel self-healing and recyclable elastomer, PU-BAMB, inspired by cartilage. This advanced material offers superior impact resistance and energy absorption for protective applications.

Keywords:
hierarchical hydrogen bondingimpact‐resistant elastomerrecyclable elastomerself‐healing materialssupramolecular polyurethaneπ–π stacking interactions

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Conventional impact materials (ceramics, metals) are brittle/heavy; soft polymers offer limited protection.
  • High-strength elastomers often use permanent covalent networks, hindering self-healing and recyclability.
  • Human articular cartilage dissipates impact but lacks self-healing.

Purpose of the Study:

  • To develop a supramolecular polyurethane-urea elastomer (PU-BAMB) with cartilage-like impact resistance, self-healing, and recyclability.
  • To emulate cartilage's fibrous-matrix architecture using hierarchical hydrogen bonding and π-π stacking.
  • To overcome limitations of natural tissues and synthetic polymers for advanced protective materials.

Main Methods:

  • Synthesized a supramolecular polyurethane-urea elastomer (PU-BAMB) using an aromatic diamine chain extender.
  • Integrated hierarchical hydrogen bonding and π-π stacking for a fibrous-matrix architecture.
  • Evaluated mechanical properties, self-healing efficiency, impact mitigation, and recyclability.

Main Results:

  • PU-BAMB achieved high tensile strength (21.08 MPa) and fracture energy (138.36 kJ m⁻²).
  • Demonstrated rapid self-healing (97% recovery in 1 hr at 90°C) and recyclability.
  • Exhibited pronounced hysteresis, strain-rate stiffening, and excellent impact-mitigation efficiency.

Conclusions:

  • The bio-inspired PU-BAMB design offers a paradigm for robust, self-healing, and recyclable impact-resistant elastomers.
  • This material shows promise for next-generation protective coatings, damping systems, and wearable devices.
  • The supramolecular approach successfully balances elasticity, rigidity, and sustainability.