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

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タイトル: Bulk Energy Dissipation Mechanism for the Fracture of Tough and Self-Healing Hydrogels
著者: Sun, Tao Lin 著作を一覧する
Luo, Feng 著作を一覧する
Hong, Wei 著作を一覧する
Cui, Kunpeng 著作を一覧する
Huang, Yiwan 著作を一覧する
Zhang, Hui Jie 著作を一覧する
King, Daniel R. 著作を一覧する
Kurokawa, Takayuki 著作を一覧する
Nakajima, Tasuku 著作を一覧する
Gong, Jian Ping 著作を一覧する
発行日: 2017年 4月11日
出版者: American Chemical Society(ACS)
誌名: Macromolecules
巻: 50
号: 7
開始ページ: 2923
終了ページ: 2931
出版社 DOI: 10.1021/acs.macromol.7b00162
抄録: 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
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 龔 剣萍 (Gong Jian Ping)


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