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Simultaneously Toughening and Stiffening Elastomers with Octuple Hydrogen Bonding.

Yizhi Zhuo1, Zhijie Xia2, Yuan Qi3

  • 1NTNU Nanomechanical Lab, Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway.

Advanced Materials (Deerfield Beach, Fla.)
|May 3, 2021
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Summary
This summary is machine-generated.

Researchers developed a transparent elastomer overcoming the toughness-stiffness trade-off using strong hydrogen bonds. This advanced material offers enhanced stretchability and fracture resistance for demanding engineering applications.

Keywords:
elastomersfracture toughnessoctuple hydrogen bondingstiffnesstoughening mechanisms

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Mechanical Engineering

Background:

  • Synthetic elastomers typically exhibit a trade-off between toughness and stiffness.
  • Existing materials struggle to meet the demanding mechanical performance requirements in various engineering fields.

Purpose of the Study:

  • To design and demonstrate a transparent elastomer with simultaneously enhanced toughness and stiffness.
  • To overcome the inherent limitations of current synthetic elastomers.

Main Methods:

  • Utilized a combination of multiscale experiments and atomistic simulations.
  • Developed elastomer networks featuring ultrastrong, reversible, and sacrificial octuple hydrogen bonding (HB).
  • Investigated the role of HB nanodomains and phase mismatch on mechanical properties.

Main Results:

  • Achieved a transparent, unfilled elastomer with significantly enhanced toughness (17016 J m⁻²) and stiffness (14.7 MPa).
  • Demonstrated that homogeneous networks with octuple HB evenly distribute stress, enhancing stretchability and delaying fracture.
  • Observed that strong HBs and phase mismatch mechanisms contribute to energy dissipation and stress alleviation.

Conclusions:

  • The designed elastomer successfully circumvents the traditional toughness-stiffness trade-off.
  • The unique HB interactions and nanostructure provide unprecedented mechanical performance.
  • This breakthrough is expected to impact diverse engineering applications requiring high-performance elastomers.