HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Life Science / Faculty of Advanced Life Science >
Peer-reviewed Journal Articles, etc >

Role of dynamic bonds on fatigue threshold of tough hydrogels

Files in This Item:
PNAS119(20)2022_LiX_author.pdf1.07 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/88978

Title: Role of dynamic bonds on fatigue threshold of tough hydrogels
Authors: Li, Xueyu Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: Fatigue threshold
dynamic bond
viscoelasticity
time–salt superposition
rate dependence
Issue Date: 17-May-2022
Publisher: National Academy of Sciences
Journal Title: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Volume: 119
Issue: 20
Start Page: e2200678119
Publisher DOI: 10.1073/pnas.2200678119
Abstract: Fatigue threshold (G0) is the energy release rate below which no fatigue crack advances. Understanding the relationship between the static/dynamic structures and G0 of viscoelastic hydrogels is crucial for designing materials exposed to cyclic loading. In this study, we elaborate the role of dynamic bonds in the G0 of tough hydrogels. Using polyampholyte hydrogels possessing abundant ionic dynamic bonds, we can adopt time–salt superposition principle to access a wide range of time scales that are difficult to access in fatigue test. G0 was found rate-independent in the elastic regime at a low cyclic strain rate, whereas weak power-law relations between G0 and strain rate were firstly observed in viscoelastic regimes. The former agrees with molecular explanation of Lake-Thomas model, and the latter is related to the self-healing property of dynamic bonds in viscoelastic regime that protects the permanent bonds from breaking. This work modifies the previous consideration that the dynamic bonds only contribute to the fracture toughness and crack resistance but not to the G0.
Type: article (author version)
URI: http://hdl.handle.net/2115/88978
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)

Submitter: 龔 剣萍 (Gong Jian Ping)

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 

 - Hokkaido University