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Related Concept Videos

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Tough and Healable Shape-Memory Elastomers Enabled by Dynamic Hyperbranched Topological Networks.

Zhao Xu1, Juan Chen1, Haili Qin1

  • 1Anhui Province Engineering Research Center of Flexible and Intelligent Materials, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|May 30, 2026
PubMed
Summary

This study introduces a novel hyperbranched topology strategy for polyurethane elastomers, achieving exceptional toughness, rapid self-healability, and shape memory for advanced soft actuators and artificial muscles.

Keywords:
dynamic hyperbranched topologypolyurethane elastomerself‐healabilityshape memorytoughness

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Integrating self-healability and shape memory into tough polyurethane elastomers is crucial for soft actuators and artificial muscles.
  • A fundamental trade-off between phase separation and dynamic interactions limits achieving both properties simultaneously.
  • Existing materials often compromise mechanical strength for stimulus responsiveness.

Purpose of the Study:

  • To engineer polyurethane elastomers with combined rapid self-healability, shape memory, and high toughness.
  • To overcome the inherent structural limitations in combining these properties.
  • To establish a design paradigm for advanced functional elastomers.

Main Methods:

  • Development of a dynamic hyperbranched topology strategy using gold nanoparticle crosslinking.
  • Engineering a hierarchical structure with dynamic topological networks and enhanced hard domains.
  • Utilizing ultrasensitive strain-induced crystallization (SIC) for network self-reinforcement.

Main Results:

  • Achieved high mechanical performance: 53 MPa strength, 483.3 MJ m-3 toughness, 352.5 kJ m-2 fracture energy.
  • Demonstrated rapid self-healability (93.5% efficiency in 2 min) via near-infrared irradiation.
  • Exhibited remarkable shape memory (91% fixation, 94.7% recovery) due to SIC-induced network fixation.

Conclusions:

  • The dynamic hyperbranched topology strategy successfully reconciles high mechanical performance with smart stimulus responsiveness.
  • The engineered elastomers offer a promising platform for next-generation artificial muscles and soft actuators.
  • This work provides a new design paradigm for advanced functional polymer materials.