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Tough Hydrogels for Load-Bearing Applications.

Nika Petelinšek1, Stefan Mommer1

  • 1Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, Zurich, 8092, Switzerland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

Tough hydrogels show promise for load-bearing uses, resisting impact. This review clarifies their mechanical properties, addressing ignored factors like water content, and discusses future applications.

Keywords:
elastic modulusenergy dissipationfracture energyload‐bearing applicationstough hydrogels

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Tough hydrogels are crucial for load-bearing applications requiring resistance to extreme mechanical impact.
  • Current benchmarking of hydrogel mechanical properties often omits critical variables like water content.
  • Enhancing mechanical properties and fracture mechanics involves diverse chemical interactions and network architectures.

Purpose of the Study:

  • To clarify reported mechanical properties of state-of-the-art tough hydrogels.
  • To provide a comprehensive library of fracture and mechanical property data.
  • To critically assess hydrogel performance by considering factors like water content.

Main Methods:

  • Introduction to common mechanical characterization methods for high-performance hydrogels.
  • Discussion of energy dissipation modes for achieving hydrogel toughness.
  • Categorization of datasets based on energy dissipation mechanisms to assess fracture properties.

Main Results:

  • A comprehensive dataset of fracture and mechanical properties for tough hydrogels is presented.
  • Analysis highlights the impact of various energy dissipation mechanisms on material toughness.
  • Comparison of tough hydrogels with existing materials reveals performance benchmarks.

Conclusions:

  • Standardized reporting of hydrogel mechanical properties, including water content, is essential for accurate comparisons.
  • Tough hydrogels offer significant potential for advanced applications.
  • Future research should focus on optimizing hydrogel design for specific load-bearing demands.