What question did this study set out to answer?

To elucidate the microscopic energy dissipation mechanisms and internal structural changes underlying the exceptional toughness of double-network hydrogels under large deformation.

March 21, 2007Macromolecules

Large Strain Hysteresis and Mullins Effect of Tough Double-Network Hydrogels

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Authors

CCCostantino CretonCentre National de la Recherche Scientifique JGJian Ping GongShenyang Pharmaceutical University

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Implication

Experimental testing demonstrates irreversible strain hysteresis from covalent bond rupture in double-network hydrogels, highlighting the structural origin of their high crack resistance.

Key Points

To elucidate the microscopic energy dissipation mechanisms and internal structural changes underlying the exceptional toughness of double-network hydrogels under large deformation.
Performed systematic cyclic loading and unloading experiments in both uniaxial tension and uniaxial compression across various maximum deformation levels.
Evaluated energy dissipation in primary and secondary cycles and applied the Lake–Thomas fracture model to quantify covalent bond breakage in the primary network.
Large hysteresis occurred during the first loading cycle and scaled strongly with maximum deformation, but vanished during the second loading cycle.
Theoretical calculations indicated that breaking and unloading only 1% of covalent bonds reduces the number of load-bearing network strands by up to 80%, demonstrating substantial network heterogeneity.

Cite This Study

Creton et al. (2007) studied this question.

synapsesocial.com/papers/6a7e2f5630b070d2738f4353 https://doi.org/10.1021/ma062924y

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Implication

Experimental testing demonstrates irreversible strain hysteresis from covalent bond rupture in double-network hydrogels, highlighting the structural origin of their high crack resistance.

Large Strain Hysteresis and Mullins Effect of Tough Double-Network Hydrogels

Discussion

Member takes

Implication

Key Points

Cite This Study

Large Strain Hysteresis and Mullins Effect of Tough Double-Network Hydrogels

Discussion

Member takes

Implication

Key Points

Cite This Study

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