Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels - ESPCI Paris - École supérieure de physique et de chimie industrielles de la ville de Paris Access content directly
Journal Articles Science Advances Year : 2021

Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels

Abstract

We investigate the fatigue resistance of chemically cross-linked polyampholyte hydrogels with a hierarchical structure due to phase separation and find that the details of the structure, as characterized by SAXS, control the mechanisms of crack propagation. When gels exhibit a strong phase contrast and a low cross-linking level, the stress singularity around the crack tip is gradually eliminated with increasing fatigue cycles and this suppresses crack growth, beneficial for high fatigue resistance. On the contrary, the stress concentration persists in weakly phase-separated gels, resulting in low fatigue resistance. A material parameter,  tran , is identified, correlated to the onset of non-affine deformation of the mesophase structure in a hydrogel without crack, which governs the slow-to-fast transition in fatigue crack growth. The detailed role played by the mesoscale structure on fatigue resistance provides design principles for developing self-healing, tough, and fatigue-resistant soft materials.
Fichier principal
Vignette du fichier
SCIENCEADVANCES_abe8210_2021.pdf (635.8 Ko) Télécharger le fichier
abe8210_movie_s1.mp4 (11.26 Mo) Télécharger le fichier
abe8210_movie_s2.mp4 (9.76 Mo) Télécharger le fichier
abe8210_movie_s3.mp4 (4.23 Mo) Télécharger le fichier
abe8210_sm.pdf (1.52 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-03247336 , version 1 (03-06-2021)

Identifiers

Cite

Xueyu Li, Kunpeng Cui, Takayuki Kurokawa, Ya Nan Ye, Tao Lin Sun, et al.. Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels. Science Advances , 2021, 7 (16), pp.eabe8210. ⟨10.1126/sciadv.abe8210⟩. ⟨hal-03247336⟩
93 View
81 Download

Altmetric

Share

Gmail Facebook X LinkedIn More