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Flexible Cages Enable Robust Supramolecular Elastomers.

Jing Xu1,2,3, Mingchao Shao1,3, Xiaoyue Wang1,2,3

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 6, 2024
PubMed
Summary
This summary is machine-generated.

A new flexible cage-reinforced supramolecular elastomer (CSE) significantly enhances material strength and toughness. This innovation balances conflicting properties, offering robust performance for demanding industrial applications.

Keywords:
energy dissipationhydrogen bondsorganic imide cagespolyurethanessupramolecular elastomers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Modern industrial technologies require advanced polymeric materials with improved strength and toughness.
  • Simultaneously achieving high strength and toughness in elastomers presents a significant engineering challenge.

Purpose of the Study:

  • To develop a novel supramolecular elastomer (CSE) with enhanced mechanical properties.
  • To investigate the role of organic imide cages (OICs) in reinforcing supramolecular networks.
  • To balance the inherent trade-off between strength and toughness in elastomers.

Main Methods:

  • Introduction of flexible organic imide cages (OICs) into supramolecular networks.
  • Experimental and theoretical analysis of the cooperative effects between hydrogen bonds and OICs.
  • Mechanical testing to evaluate strength, toughness, tear resistance, and anti-fatigue properties.

Main Results:

  • The developed CSE exhibits remarkable robustness, tear resistance, anti-fatigue, and shape memory properties.
  • Inclusion of minimal amounts of OICs led to a ≈10-fold increase in mechanical strength (85.0 MPa) and a ≈7-fold increase in toughness (418.4 MJ m⁻³).
  • The cooperative effect of gradient hydrogen bonds and OICs acts as flexible nodes, creating more robust supramolecular networks.

Conclusions:

  • The flexible cage-reinforcement strategy effectively balances the conflicting requirements of strength and toughness in elastomers.
  • The prepared CSEs demonstrate potential for large-scale applications, including in Tunnel Boring Machines (TBMs).
  • This work presents a pioneering approach to designing high-performance supramolecular elastomers.