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Effect of Structure Heterogeneity on Mechanical Performance of Physical Polyampholytes Hydrogels

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Title: Effect of Structure Heterogeneity on Mechanical Performance of Physical Polyampholytes Hydrogels
Authors: Cui, Kunpeng Browse this author
Ye, Ya Nan Browse this author
Sun, Tao Lin Browse this author
Chen, Liang Browse this author
Li, Xueyu Browse this author
Kurokawa, Takayuki Browse this author
Nakajima, Tasuku Browse this author
Nonoyama, Takayuki Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 8-Oct-2019
Publisher: American Chemical Society(ACS)
Journal Title: Macromolecules
Volume: 52
Issue: 19
Start Page: 7369
End Page: 7378
Publisher DOI: 10.1021/acs.macromol.9b01676
Abstract: Recent studies reported a multiscale structure in tough and self-healing hydrogels containing physical associations. For example, a type of tough and self-healing hydrogel from charge-balanced polyampholytes (PA) has a mesoscale bicontinuous double network structure with structural length around 400 nm. This mesoscale network structure plays an essential role in the multistep rupture process, which leads to the high toughness of PA hydrogels. In this work, by using an osmotic stress method, we symmetrically studied how the relative strength of soft and hard networks and the strength of ionic bonds influence the property of PA gels. We found that increasing osmotic stress of the bath solution triggers the structure transition from bicontinuous double network structure to a homogeneous structure, which drives the concurrently opaque−transparent transition in optical property and viscoelastic−glassy transition in mechanical behavior. The gels around the structural transition point were found to possess both high toughness (fracture energy of 7200 J m−2) and high stiffness (Young’s modulus of 12.9 MPa), which is a synergy of soft network and hard network of the bicontinuous structure. Our work not only provides an approach to tune the structure and property of physical hydrogels through tuning physical association but also gives a demo to investigate their relationships, yet another step forward gives inspiration to design a new type of tough and self-healing materials around the structural transition point.
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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