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Elastic, strong and tough ionically conductive elastomers.

Burebi Yiming1,2, Simon Hubert3, Alex Cartier1

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|January 6, 2025
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Researchers developed advanced ionically conductive elastomers (ICEs) using a multiple network elastomer (MNE) architecture. These materials achieve high strength and ionic conductivity simultaneously, overcoming previous limitations for wearable electronics and batteries.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemical Engineering

Background:

  • Stretchable elastic materials are crucial for advanced applications like wearable devices and flexible batteries.
  • Achieving a simultaneous combination of high mechanical strength, toughness, and ionic conductivity in elastomers has been a significant challenge.
  • Existing materials often exhibit a trade-off, sacrificing one property for another.

Purpose of the Study:

  • To develop novel ionically conductive elastomers (ICEs) that exhibit excellent mechanical properties and high ionic conductivity without compromise.
  • To investigate the effectiveness of a multiple network elastomer (MNE) architecture in achieving this balance.
  • To explore the relationship between material architecture, mechanical performance, and ionic transport.

Main Methods:

  • Synthesis of ionically conductive elastomers incorporating a multiple network elastomer (MNE) architecture.
  • Characterization of mechanical properties, including stiffness, elasticity, and fracture resistance.
  • Measurement of ionic conductivity at room temperature.
  • Comparison of MNE-based ICEs with simple network elastomers.

Main Results:

  • The developed ICEs with the MNE architecture demonstrated high ionic conductivity (order of 10^-3 S/cm) and significant mechanical strength (stress at break ~8 MPa).
  • In contrast, elastomers without the MNE architecture exhibited substantially lower ionic conductivity (10^-5 S/cm) and lower strength (<1.5 MPa).
  • The MNE architecture effectively enhanced segmental mobility, improving ionic conductivity while maintaining mechanical integrity through sacrificial bond mechanisms.

Conclusions:

  • The MNE architecture provides a viable strategy to create high-performance ionically conductive elastomers.
  • These materials overcome the typical trade-offs between mechanical robustness and ionic conductivity.
  • The developed ICEs show great promise for applications in wearable electronics, stretchable batteries, and other advanced flexible devices.