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A Highly Stretchable Self-Healing Poly(dimethylsiloxane) Elastomer with Reprocessability and Degradability.

Chi Lv1, Kaifeng Zhao1, Junping Zheng1

  • 1Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.

Macromolecular Rapid Communications
|February 6, 2018
PubMed
Summary

Researchers developed a new poly(dimethylsiloxane) elastomer with remarkable stretchability and room-temperature self-healing capabilities. This advanced material also offers repeatable reprocessing and controlled degradation, thanks to a dual-dynamic-covalent sacrificial system.

Keywords:
degradabilityhigh stretchabilitypoly(dimethylsiloxane) elastomersreprocessabilityself-healing materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Synthesizing materials with both high stretchability and self-healability presents significant challenges.
  • Existing elastomers often lack robust performance across multiple properties like recyclability and controlled degradation.

Purpose of the Study:

  • To develop a novel poly(dimethylsiloxane) elastomer exhibiting superior stretchability and room-temperature self-healability.
  • To engineer a material with repeatable reprocessability and controlled degradability.

Main Methods:

  • Incorporation of aromatic disulfide and imine bonds into a poly(dimethylsiloxane) backbone.
  • Characterization of mechanical properties, including tensile strength and elongation at break.
  • Evaluation of self-healing efficiency, reprocessing stability, and degradation pathways.

Main Results:

  • The synthesized elastomer demonstrated exceptional stretchability exceeding 2200% of its original length.
  • Complete self-healing of damaged samples was achieved within 4 hours at room temperature without external stimuli.
  • The material exhibited repeatable reprocessability with no significant performance loss and could be controllably degraded via three distinct methods.

Conclusions:

  • A novel poly(dimethylsiloxane) elastomer with a unique dual-dynamic-covalent sacrificial system was successfully synthesized.
  • The material's remarkable stretchability, self-healability, reprocessability, and degradability open new avenues for advanced elastomer applications.