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Fast room-temperature self-healing siloxane elastomer for healable stretchable electronics.

Liwei Zhao1, Yue Yin2, Bo Jiang2

  • 1Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin 150040, China; MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

Journal of Colloid and Interface Science
|April 12, 2020
PubMed
Summary

Researchers developed a new siloxane elastomer with high stretchability and rapid room-temperature self-healing. This material demonstrates excellent mechanical properties, enabling advanced applications in stretchable electronics.

Keywords:
ElectronicsSelf-healingSiloxane elastomerStretchability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Siloxane elastomers are crucial for advanced applications due to their unique properties.
  • Achieving high stretchability, rapid self-healing, and robust mechanical performance simultaneously remains a significant challenge.
  • Dynamic covalent bonds offer potential for creating self-healing materials.

Purpose of the Study:

  • To synthesize a novel siloxane elastomer with enhanced stretchability and fast room-temperature self-healing capabilities.
  • To investigate the role of aromatic disulfides in achieving these properties.
  • To demonstrate the material's utility in fabricating self-healing stretchable electronics.

Main Methods:

  • Incorporation of aromatic disulfides into a siloxane polymer matrix.
  • Characterization of mechanical properties, including tensile stress and elongation at break.
  • Evaluation of self-healing efficiency at room temperature under various conditions (e.g., surface aging, overlap contact).
  • Fabrication and testing of stretchable electrodes and strain sensors.

Main Results:

  • The synthesized siloxane elastomer achieved a tensile stress of 0.5 MPa and elongation at break exceeding 1000%.
  • Demonstrated a self-healing efficiency of over 95% at room temperature, recovering 357% elongation after one minute of healing.
  • Maintained over 90% healing efficiency even after surface aging or using overlap contact, attributed to dynamic disulfide bonds.
  • Successfully utilized as a substrate for stretchable electrodes and strain sensors, exhibiting high stretchability, fast self-healing, durability, and stability.

Conclusions:

  • A novel stretchable, fast self-healing siloxane elastomer was successfully synthesized using aromatic disulfides.
  • The dynamic disulfide bonds are key to the material's rapid and efficient self-healing properties.
  • The developed elastomer shows significant promise for applications in durable and repairable stretchable and wearable electronics.