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Fatigue-resistant and tough double network granular elastomers.

Eva Baur1,2, John Kolinski3, Esther Amstad1,2

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Double-network granular elastomers (DNGEs) overcome the stiffness-toughness compromise. These novel materials offer combined toughness and fatigue resistance for advanced soft robotics and biomedical applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Single-network elastomers face a stiffness-toughness trade-off, limiting their applications.
  • Multinetwork elastomers improve toughness but often lack fatigue resistance.

Purpose of the Study:

  • To develop elastomers that simultaneously exhibit stiffness, toughness, and fatigue resistance.
  • To explore the potential of double-network granular elastomers (DNGEs) for advanced material applications.

Main Methods:

  • Engineered double-network granular elastomers (DNGEs) using stiff elastomer microparticles and a softer second network.
  • Investigated the stress deconcentration and energy dissipation mechanisms within DNGEs.
  • Utilized 3D printability to spatially vary composition and properties within a single elastomer.

Main Results:

  • DNGEs demonstrate a unique combination of toughness and fatigue resistance.
  • Local variations in composition and structure enable efficient stress deconcentration and energy dissipation.
  • Spatially controlled DNGEs integrate stiffness, toughness, and fatigue resistance within one material.

Conclusions:

  • DNGEs effectively address the stiffness-toughness-fatigue resistance trade-off in soft materials.
  • The developed elastomers show significant promise for soft robotics, wearable electronics, and biomedical devices.
  • This work opens new avenues for designing high-performance soft materials.