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Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels

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Title: Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels
Authors: Li, Xueyu Browse this author
Cui, Kunpeng Browse this author
Kurokawa, Takayuki Browse this author
Ye, Ya Nan Browse this author
Sun, Tao Lin Browse this author
Yu, Chengtao Browse this author
Creton, Costantino Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: Apr-2021
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science advances
Volume: 7
Issue: 16
Start Page: eabe8210
Publisher DOI: 10.1126/sciadv.abe8210
Abstract: We investigate the fatigue resistance of chemically cross-linked polyampholyte hydrogels with a hierarchical structure due to phase separation and find that the details of the structure, as characterized by SAXS, control the mechanisms of crack propagation. When gels exhibit a strong phase contrast and a low cross-linking level, the stress singularity around the crack tip is gradually eliminated with increasing fatigue cycles and this suppresses crack growth, beneficial for high fatigue resistance. On the contrary, the stress concentration persists in weakly phase-separated gels, resulting in low fatigue resistance. A material parameter, lambda(max), is identified, correlated to the onset of non-affine deformation of the mesophase structure in a hydrogel without crack, which governs the slow-to-fast transition in fatigue crack growth. The detailed role played by the mesoscale structure on fatigue resistance provides design principles for developing self-healing, tough, and fatigue-resistant soft materials.
Type: article
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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