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Macroscale Double Networks: Design Criteria for Optimizing Strength and Toughness

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Title: Macroscale Double Networks: Design Criteria for Optimizing Strength and Toughness
Authors: King, Daniel R. Browse this author
Okumura, Tsuyoshi Browse this author
Takahashi, Riku Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: Double network
Topological interlocking toughness
Issue Date: 25-Sep-2019
Publisher: American Chemical Society
Journal Title: ACS applied materials & interfaces
Volume: 11
Issue: 38
Start Page: 35343
End Page: 35353
Publisher DOI: 10.1021/acsami.9b12935
PMID: 31475822
Abstract: The double network concept, based on the fracture of sacrificial bonds, has been revolutionary toward the creation of robust soft materials. Based on the essence of double network hydrogels, macroscale, three-dimensional printed rigid sacrificial networks are embedded within silicone rubber stretchable matrices. Preferential fracture of the sacrificial network results in a , similar to 60 time increase in stiffness and a similar to 50% increase in the work of extension compared with the neat matrix. Maximizing yield strength while maintaining multistep internal fracture occurs when the strength of the sacrificial network approaches the strength of the matrix. Upon determining the optimal sacrificial network strength, the sacrificial bond section density can be increased to maximize energy dissipation and toughening efficiencies up to similar to 70% of the maximum theoretical toughness are achieved. High toughness and dissipation are achieved because topological interlocking enables significant force transmission to the sacrificial network at smaller length scales than interfacial adhesion, allowing much higher sacrificial bond density. This method is general and can be used with a variety of materials systems, without requiring strong interfacial adhesion, contrasting traditional composite systems. Demonstrating that the double network concept can be used at length scales far beyond the molecular scale will have important implications toward the development of future structural materials.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and interfaces, copyright c 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: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)


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