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Effect of Relative Strength of Two Networks on the Internal Fracture Process of Double Network Hydrogels As Revealed by in Situ Small-Angle X-ray Scattering
| Title: | Effect of Relative Strength of Two Networks on the Internal Fracture Process of Double Network Hydrogels As Revealed by in Situ Small-Angle X-ray Scattering |
| Authors: | Fukao, Kazuki Browse this author | | Nakajima, Tasuku Browse this author →KAKEN DB | | Nonoyama, Takayuki Browse this author | | Kurokawa, Takayuki Browse this author | | Kawai, Takahiko Browse this author | | Gong, Jian Ping Browse this author →KAKEN DB |
| Issue Date: | 2020 |
| Publisher: | American Chemical Society(ACS) |
| Journal Title: | Macromolecules |
| Volume: | 53 |
| Issue: | 4 |
| Start Page: | 1154 |
| End Page: | 1163 |
| Publisher DOI: | 10.1021/acs.macromol.9b02562 |
| Abstract: | Double network hydrogels (DN gels) exhibit extraordinarily high strength and toughness by interplay of the two contrasting networks: the rigid, brittle network serves as a sacrificial bond that fractures at a relatively low strain, while the soft, stretchable network serves as hidden length that sustains stress by large extension afterward. The internal fracture process of the brittle network strongly depends on the relative strength of the two networks. In this study, we study the internal fracturing process of typical DN gels that show yielding or necking under uniaxial stretching using in situ small-angle X-ray scattering. Two samples consisting of the same brittle first network from poly(2-acrylamido-2-methylpropanesulfonic acid) but stretchable second network from poly(N,N-dimethylacrylamide) of different concentrations were adopted. We found that (1) the brittle network shows nonaffine deformation even far below the yield strain by local fracture; (2) for the sample of low second network concentration, significant strain amplification occurs around the submicrometer-scale voids (defects) preexisting in the brittle network, which induces the fracture percolation of brittle network from voids to show the necking phenomenon; and (3) the strain amplification at voids is suppressed in the sample of high second network concentration, and fracture of brittle network occurs dispersedly, showing yielding without necking. |
| 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 https://pubs.acs.org/doi/abs/10.1021/acs.macromol.9b02562. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/80360 |
| 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)
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Submitter: 龔 剣萍 (Gong Jian Ping)
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