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Revealing Hidden Length by Force: Decoupling Modulus and Toughness in Network Gels

Shakkeeb Thazhathethil1, Xiaoran Hu1

  • 1Department of Chemistry, BioInspired Institute, Syracuse University, Syracuse, New York 13244, United States.

ACS Central Science
|October 27, 2025
PubMed
Summary

This study shows that reactive strand extension can separate toughness from modulus in gels. This finding is crucial for designing advanced polymer materials with tailored mechanical properties.

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Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...