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How chain dynamics affects crack initiation in double-network gels

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Title: How chain dynamics affects crack initiation in double-network gels
Authors: Zheng, Yong Browse this author
Matsuda, Takahiro Browse this author
Nakajima, Tasuku Browse this author →KAKEN DB
Cui, Wei Browse this author
Zhang, Ye Browse this author
Hui, Chung-Yuen Browse this author
Kurokawa, Takayuki Browse this author
Gong, Jian Ping Browse this author
Keywords: chain dynamics
crack initiation
double-network gels
nonlinear crack tip analysis
Issue Date: 7-Dec-2021
Publisher: National Academy of Sciences.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Volume: 118
Issue: 49
Start Page: e2111880118
Publisher DOI: 10.1073/pnas.2111880118
Abstract: Double-network gels are a class of tough soft materials comprising two elastic networks with contrasting structures. The formation of a large internal damage zone ahead of the crack tip by the rupturing of the brittle network accounts for the large crack resistance of the materials. Understanding what determines the damage zone is the central question of the fracture mechanics of doublenetwork gels. In this work, we found that at the onset of crack propagation, the size of necking zone, in which the brittle network breaks into fragments and the stretchable network is highly stretched, distinctly decreases with the increase of the solvent viscosity, resulting in a reduction in the fracture toughness of the material. This is in sharp contrast to the tensile behavior of the material that does not change with the solvent viscosity. This result suggests that the dynamics of stretchable network strands, triggered by the rupture of the brittle network, plays a role. To account for this solvent viscosity effect on the crack initiation, a delayed blunting mechanism regarding the polymer dynamics effect is proposed. The discovery on the role of the polymer dynamic adds an important missing piece to the fracture mechanism of this unique material.
Type: article
URI: http://hdl.handle.net/2115/85724
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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