Damageless Tough Hydrogels with On-demand Self-reinforcement

Most tough hydrogels are reinforced by introducing sacrificial structures that can dissipate input energy. However, since the sacrificial damages cannot recover instantly, the toughness of these gels drops substantially during consecutive cyclic loadings. Here, we propose a new damageless reinforcem...

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Bibliographic Details
Published in:arXiv.org 2021-04
Main Authors: Liu, Chang, Fujiyabu, Takeshi, Morimoto, Naoya, Jiang, Lan, Yokoyama, Hideaki, Sakai, Takamasa, Koichi Mayumi, Ito, Kohzo
Format: Article
Language:English
Subjects:
Connective tissues
Crack tips
Crystallization
Elongation
Energy dissipation
Energy recovery
Hydrogels
Stress concentration
Online Access:Get full text
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Summary:Most tough hydrogels are reinforced by introducing sacrificial structures that can dissipate input energy. However, since the sacrificial damages cannot recover instantly, the toughness of these gels drops substantially during consecutive cyclic loadings. Here, we propose a new damageless reinforcement strategy for hydrogels utilizing strain-induced crystallization (SIC). In Slide-Ring (SR) gels with freely movable cross-links, crystalline repetitively forms and destructs with elongation and relaxation, resulting in both excellent toughness of 5.5 - 25.2 MJ/m\(^3\) and 87% - 95% instant recovery of extension energy between two consecutive 11-fold loading-unloading cycles. Moreover, SIC occurs "on-demandly" at the crack-tip area where strain amplification and stress concentration take place and forces the crack to turn sideways. The instantly reversible tough hydrogels are promising candidates for applications in artificial connective tissues such as tendon and ligament.
ISSN:2331-8422