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Characterization of internal fracture process of double network hydrogels under uniaxial elongation

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Title: Characterization of internal fracture process of double network hydrogels under uniaxial elongation
Authors: Nakajima, Tasuku Browse this author
Kurokawa, Takayuki Browse this author
Ahmed, Saika Browse this author
Wu, Wen-li Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 14-Feb-2013
Publisher: Royal Society of Chemistry
Journal Title: Soft Matter
Volume: 9
Issue: 6
Start Page: 1955
End Page: 1966
Publisher DOI: 10.1039/c2sm27232f
Abstract: Previously we revealed that the high toughness of double network hydrogels (DN gels) derives from the internal fracture of the brittle network during deformation, which dissipates energy as sacrificial bonds. In this study, we intend to elucidate the detailed internal fracture process of DN gels. We quantitatively analysed the tensile hysteresis and re-swelling behaviour of a DN gel that shows a well-defined necking and strain hardening, and obtained the following new findings: 1) Fracture of the 1st network PAMPS starts far below the yielding strain, and 90% of the initially load-bearing PAMPS chains already break at the necking point. 2) The dominant internal fracture process occurs in the necking and hardening region, although the softening mainly occurs before necking. 3) The internal fracture efficiency is very high, 85% of the work is used for the internal fracture and 9% of all PAMPS chains break at sample failure. 4) The internal fracture is anisotropic, fracture occurs preferentially perpendicular to the tensile direction than other two directions, but the fracture anisotropy decreases in the hardening region. Results 1) and 2) is in agreement with a hierarchical structural model of the PAMPS network. Based on these findings, we present a revised description of the fracture process of DN gels.
Rights: Soft Matter, 2013,9, 1955-1966 - Reproduced by permission of The Royal Society of Chemistry (RSC)
Type: article (author version)
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: 中島 祐

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