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Anisotropic Double-Network Hydrogels via Controlled Orientation of a Physical Sacrificial Network

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Title: Anisotropic Double-Network Hydrogels via Controlled Orientation of a Physical Sacrificial Network
Authors: King, Daniel R. Browse this author
Takahashi, Riku Browse this author
Ikai, Takuma Browse this author
Fukao, Kazuki Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: hydrogels
semirigid polymers
composite materials
double-network gels
anisotropic structures
anisotropic mechanical properties
Issue Date: 12-Jun-2020
Publisher: American Chemical Society
Journal Title: ACS applied polymer materials
Volume: 2
Issue: 6
Start Page: 2350
End Page: 2358
Publisher DOI: 10.1021/acsapm.0c00290
Abstract: We report a method to create anisotropic double-network (DN) hydrogels, through the controlled orientation of a physical sacrificial network. A cross-linked polyacrylamide hydrogel is synthesized from a solution containing a semirigid anionic polyelectrolyte. Subsequently, the gel is stretched to orient the semirigid polyelectrolyte, which does not relax in the stretched state because of the high contour length in comparison to the mesh size of the polyacrylamide network. The polyelectrolyte is then physically cross-linked with a multivalent cation, ZrCl2O, to fix the anisotropy. Anisotropy was visualized by observing birefringence and quantified by small-angle X-ray scattering. By comparing the scattering in the oriented direction versus perpendicular to the oriented direction, a structural anisotropy factor was calculated. Uniaxial tensile testing was performed on samples of varying prestretch, both parallel and perpendicular to the stretching direction. Young's modulus, fracture stress, fracture strain, and work of extension were characterized, and the resulting mechanical anisotropy was compared to the structural anisotropy factor. We find that the anisotropy of Young's modulus and fracture stress is directly controlled by the anisotropy of the sacrificial network, while fracture strain and work of extension show little influence from structural anisotropy. The results of this work demonstrate that prestretching of a physical sacrificial network is a controllable and simple method to create anisotropic DN hydrogels.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied polymer materials, copyright ©2020 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acsapm.0c00290
Type: article (author version)
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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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