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An Extremely Stretchable and Self-Healable Supramolecular Polymer Network.

Huan Zhang1,2, Shijia Yang1, Zhusheng Yang1,2

  • 1Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS Applied Materials & Interfaces
|January 12, 2021
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Summary

Researchers developed advanced polymer networks with extreme stretchability and rapid self-healing. This breakthrough in supramolecular polymer materials offers enhanced mechanical properties for flexible, self-healing conductors.

Keywords:
PPGautonomous self-healingdynamic bondextreme stretchabilityhydrogen bondmetal−ligand bond

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Developing single polymer networks with high stretchability, mechanical strength, and self-healing is challenging.
  • Existing materials often compromise one property for another.

Purpose of the Study:

  • To fabricate supramolecular polymer networks with synergistic metal-ligand and hydrogen bonds.
  • To achieve extreme stretchability, high mechanical strength, and autonomous room-temperature self-healing.
  • To demonstrate the tunability of mechanical properties and self-healing by adjusting chain extender content.

Main Methods:

  • Incorporation of metal-ligand and hydrogen bonds into poly(propylene glycol) (PPG).
  • Fabrication of supramolecular polymer networks using specific formulations (e.g., PPG-Im-MDA-1.5-0.25-Cu).
  • Characterization of mechanical properties (stretching ratio, Young's modulus) and self-healing efficiency.

Main Results:

  • The representative specimen exhibited an extreme stretching ratio of 346 ± 14× and a Young's modulus of 2.10 ± 0.14 MPa.
  • Complete recovery of mechanical performance within 1 hour was achieved for destroyed specimens.
  • Mechanical properties and self-healing were tunable by altering chain extender concentration.

Conclusions:

  • The synergistic incorporation of metal-ligand and hydrogen bonds in PPG creates highly stretchable and self-healing polymer networks.
  • This strategy offers a pathway to design advanced materials with tunable mechanical properties and self-healing capabilities.
  • The developed supramolecular PPG network is applicable in flexible and self-healable conductors.