Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch

Abstract We propose a new concept that utilizes the difference in Poisson's ratio between component materials as a strengthening mechanism that increases the effectiveness of the sacrificial bond toughening mechanism in macroscale double-network (Macro-DN) materials. These Macro-DN composites c...

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Autores principales:	Tsuyoshi Okumura, Riku Takahashi, Katsumi Hagita, Daniel R. King, Jian Ping Gong
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/399b69cc510649fa9f414c0697b10e08
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spelling	oai:doaj.org-article:399b69cc510649fa9f414c0697b10e082021-12-02T18:02:44ZImproving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch10.1038/s41598-021-92773-02045-2322https://doaj.org/article/399b69cc510649fa9f414c0697b10e082021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92773-0https://doaj.org/toc/2045-2322Abstract We propose a new concept that utilizes the difference in Poisson's ratio between component materials as a strengthening mechanism that increases the effectiveness of the sacrificial bond toughening mechanism in macroscale double-network (Macro-DN) materials. These Macro-DN composites consist of a macroscopic skeleton imbedded within a soft elastic matrix. We varied the Poisson's ratio of the reinforcing skeleton by introducing auxetic or honeycomb functional structures that results in Poisson’s ratio mismatch between the skeleton and matrix. During uniaxial tensile experiments, high strength and toughness were achieved due to two events: (1) multiple internal bond fractures of the skeleton (like sacrificial bonds in classic DN gels) and (2) significant, biaxial deformation of the matrix imposed by the functional skeleton. The Macro-DN composite with auxetic skeleton exhibits up to 4.2 times higher stiffness and 4.4 times higher yield force than the sum of the component materials. The significant improvement in mechanical performance is correlated to the large mismatch in Poisson's ratio between component materials, and the enhancement is especially noticeable in the low-stretch regime. The strengthening mechanism reported here based on Poisson's ratio mismatch can be widely used for soft materials regardless of chemical composition and will improve the mechanical properties of elastomer and hydrogel systems.Tsuyoshi OkumuraRiku TakahashiKatsumi HagitaDaniel R. KingJian Ping GongNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tsuyoshi Okumura Riku Takahashi Katsumi Hagita Daniel R. King Jian Ping Gong Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
description	Abstract We propose a new concept that utilizes the difference in Poisson's ratio between component materials as a strengthening mechanism that increases the effectiveness of the sacrificial bond toughening mechanism in macroscale double-network (Macro-DN) materials. These Macro-DN composites consist of a macroscopic skeleton imbedded within a soft elastic matrix. We varied the Poisson's ratio of the reinforcing skeleton by introducing auxetic or honeycomb functional structures that results in Poisson’s ratio mismatch between the skeleton and matrix. During uniaxial tensile experiments, high strength and toughness were achieved due to two events: (1) multiple internal bond fractures of the skeleton (like sacrificial bonds in classic DN gels) and (2) significant, biaxial deformation of the matrix imposed by the functional skeleton. The Macro-DN composite with auxetic skeleton exhibits up to 4.2 times higher stiffness and 4.4 times higher yield force than the sum of the component materials. The significant improvement in mechanical performance is correlated to the large mismatch in Poisson's ratio between component materials, and the enhancement is especially noticeable in the low-stretch regime. The strengthening mechanism reported here based on Poisson's ratio mismatch can be widely used for soft materials regardless of chemical composition and will improve the mechanical properties of elastomer and hydrogel systems.
format	article
author	Tsuyoshi Okumura Riku Takahashi Katsumi Hagita Daniel R. King Jian Ping Gong
author_facet	Tsuyoshi Okumura Riku Takahashi Katsumi Hagita Daniel R. King Jian Ping Gong
author_sort	Tsuyoshi Okumura
title	Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
title_short	Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
title_full	Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
title_fullStr	Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
title_full_unstemmed	Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch
title_sort	improving the strength and toughness of macroscale double networks by exploiting poisson’s ratio mismatch
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/399b69cc510649fa9f414c0697b10e08
work_keys_str_mv	AT tsuyoshiokumura improvingthestrengthandtoughnessofmacroscaledoublenetworksbyexploitingpoissonsratiomismatch AT rikutakahashi improvingthestrengthandtoughnessofmacroscaledoublenetworksbyexploitingpoissonsratiomismatch AT katsumihagita improvingthestrengthandtoughnessofmacroscaledoublenetworksbyexploitingpoissonsratiomismatch AT danielrking improvingthestrengthandtoughnessofmacroscaledoublenetworksbyexploitingpoissonsratiomismatch AT jianpinggong improvingthestrengthandtoughnessofmacroscaledoublenetworksbyexploitingpoissonsratiomismatch
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Improving the strength and toughness of macroscale double networks by exploiting Poisson’s ratio mismatch

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