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Inverse mechanical-swelling coupling of a highly deformed double-network gel.

ABSTRACT: Mechanical behaviors of a polymer gel are coupled with its swelling behavior. It has been known that typical hydrogels display extension-induced swelling and drying-induced stiffening, called normal mechanical-swelling coupling. In this study, we experimentally found that highly extended double-network (DN) hydrogels exhibit abnormal inverse mechanical-swelling coupling such as extension-induced deswelling and drying-induced softening. We established theoretical hyperelastic and swelling models that reproduced all the complicated mechanical and swelling trends of the highly deformed DN hydrogels. From these theoretical analyses, it is considered that the inverse mechanical-swelling coupling of a DN gel is derived from the extreme nonlinear elasticity of its first network at its ultimate deformation state. These findings contribute toward the understanding of the mechanics of rubber-like materials up to their ultimate deformation and fracture limit.

SUBMITTER: Imaoka C

PROVIDER: S-EPMC10171803 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Inverse mechanical-swelling coupling of a highly deformed double-network gel.

Imaoka Chika C Nakajima Tasuku T Indei Tsutomu T Iwata Masaya M Hong Wei W Marcellan Alba A Gong Jian Ping JP

Science advances 20230510 19

Mechanical behaviors of a polymer gel are coupled with its swelling behavior. It has been known that typical hydrogels display extension-induced swelling and drying-induced stiffening, called normal mechanical-swelling coupling. In this study, we experimentally found that highly extended double-network (DN) hydrogels exhibit abnormal inverse mechanical-swelling coupling such as extension-induced deswelling and drying-induced softening. We established theoretical hyperelastic and swelling models ...[more]

PMID: 37163599

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