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Creep Behavior and Delayed Fracture of Tough Polyampholyte Hydrogels by Tensile Test

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Title: Creep Behavior and Delayed Fracture of Tough Polyampholyte Hydrogels by Tensile Test
Authors: Karobi, Sadia Nazneen Browse this author
Sun, Tao Lin Browse this author
Kurokawa, Takayuki Browse this author
Luo, Feng Browse this author
Nakajima, Tasuku Browse this author
Nonoyama, Takayuki Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 9-Aug-2016
Publisher: American Chemical Society(ACS)
Journal Title: Macromolecules
Volume: 49
Issue: 15
Start Page: 5630
End Page: 5636
Publisher DOI: 10.1021/acs.macromol.6b01016
Abstract: Polyampholyte (PA) hydrogels are a new class of tough and selfhealing supramolecular hydrogels that have a potential as load-bearing soft materials. Studying on the creep behavior of these hydrogels and understanding the molecular mechanism are important for prediction of lifetime of the materials. In the present work, we study the creep rupture dynamics of the PA hydrogels with and without chemical cross-linking, in a certain observation time window. We have found that above some critical loading stress both physical and lightly chemically cross-linked hydrogels undergo creep rupture while moderately chemically cross-linked hydrogel resists creep flow. To elucidate the molecular mechanism, we have further compared the creep behaviors of the physical and lightly chemically cross-linked samples. The creep rate of the samples decreases with the creep time, following a power law relation, regardless of the loading stress variation. The fracture time of both of these hydrogels exponentially decreases with the increase of the loading stress, following the same master curve at high loading stress region, while the behavior of the two samples becomes different in the low loading stress region. We have explained the delayed fracture dynamics at high loading stress region in terms of a relatively weak strong bond rupture mechanism.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
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: 龔 剣萍 (Gong Jian Ping)

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