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Mesoscale bicontinuous networks in self-healing hydrogels delay fatigue fracture

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Title: Mesoscale bicontinuous networks in self-healing hydrogels delay fatigue fracture
Authors: Li, Xueyu Browse this author
Cui, Kunpeng Browse this author
Sun, Tao Lin Browse this author
Meng, Lingpu Browse this author
Yu, Chengtao Browse this author
Li, Liangbin Browse this author
Creton, Costantino Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: fatigue resistance
hierarchical structure
phase network
crack growth
affine deformation
Issue Date: 7-Apr-2020
Publisher: National Academy of Sciences.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Volume: 117
Issue: 14
Start Page: 7606
End Page: 7612
Publisher DOI: 10.1073/pnas.2000189117
Abstract: Load-bearing biological tissues, such as muscles, are highly fatigue-resistant, but how the exquisite hierarchical structures of biological tissues contribute to their excellent fatigue resistance is not well understood. In this work, we study antifatigue properties of soft materials with hierarchical structures using polyampholyte hydrogels (PA gels) as a simple model system. PA gels are tough and self-ealing, consisting of reversible ionic bonds at the 1-nm scale, a cross-linked polymer network at the 10-nm scale, and bicontinuous hard/soft phase networks at the 100-nm scale. We find that the polymer network at the 10-nm scale determines the threshold of energy release rate G(0) above which the crack grows, while the bicontinuous phase networks at the 100-nm scale significantly decelerate the crack advance until a transition G(tran) far above G(0). In situ small-angle X-ray scattering analysis reveals that the hard phase network suppresses the crack advance to show decelerated fatigue fracture, and G(tran) corresponds to the rupture of the hard phase network.
Type: article (author version)
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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