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Bulk Energy Dissipation Mechanism for the Fracture of Tough and Self-Healing Hydrogels

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Title: Bulk Energy Dissipation Mechanism for the Fracture of Tough and Self-Healing Hydrogels
Authors: Sun, Tao Lin Browse this author
Luo, Feng Browse this author
Hong, Wei Browse this author
Cui, Kunpeng Browse this author
Huang, Yiwan Browse this author
Zhang, Hui Jie Browse this author
King, Daniel R. Browse this author
Kurokawa, Takayuki Browse this author
Nakajima, Tasuku Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 11-Apr-2017
Publisher: American Chemical Society(ACS)
Journal Title: Macromolecules
Volume: 50
Issue: 7
Start Page: 2923
End Page: 2931
Publisher DOI: 10.1021/acs.macromol.7b00162
Abstract: Recently, many tough and self-healing hydrogels have been developed based on physical bonds as reversible sacrificial bonds. As breaking and re-forming of physical bonds are time-dependent, these hydrogels are viscoelastic and the deformation rate and temperature pronouncedly influence their fracture behavior. Using a polyampholyte hydrogel as a model system, we observed that the time–temperature superposition principle is obeyed not only for the small strain rheology but also for the large strain hysteresis energy dissipation and the fracture energy below a certain temperature. The three processes possess the same shift factors that obey the equation of Williams, Landel, and Ferry (WLF) time–temperature equivalence. The fracture energy Γ scales with the crack velocity Vc over a wide velocity range as Γ ∼ Vcα (α = 0.21). The exponent α of the power law is well-related to the exponent κ of the relaxation modulus G(t) ∼ t–κ (κ = 0.26), obeying the prediction α = κ/(1 + κ) from classic viscoelasticity theory. These results show that the fracture energy of the polyampholyte gel is dominated by the bulk viscoelastic energy dissipated around the crack tip. This investigation gives an insight into designing tough and self-healing hydrogels and predicting their fracture behaviors from their dynamic mechanical spectrum.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright ©2017 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.macromol.7b00162
Type: article (author version)
URI: http://hdl.handle.net/2115/68615
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)

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