自愈水凝胶
断裂(地质)
琼脂
化学
材料科学
化学工程
高分子化学
复合材料
地质学
工程类
古生物学
细菌
作者
Haiyan Yin,Min You,Hui Yu,Xinlei Si,Yong Zheng,Wei Cui,Lin Zhu,Qiang Chen
出处
期刊:Macromolecules
[American Chemical Society]
日期:2024-05-06
卷期号:57 (9): 4024-4033
标识
DOI:10.1021/acs.macromol.3c02605
摘要
The advanced development of soft yet tough hydrogels with high crack resistance significantly extends their application scope from biomedical applications for tissue engineering to emerging electronics applications for soft flexible devices. We investigated the fracture toughness of agar/PAAm hybrid double-network (DN) hydrogels at various strain rates. In large deformations without precut, the loading–unloading curves of agar/PAAm hybrid DN hydrogels exhibit rate-independent hysteresis. However, the fracture toughness of the precut agar/PAAm hybrid DN hydrogel exhibits a transition region around strain rate (ε̇) as 0.12 s–1, and rate-independent toughness is observed at ε̇ < 0.12 s–1, while the fracture toughness decreases significantly if ε̇ > 0.12 s–1. We also discover that the fracture toughness scales with strain rate as Γ ∼ (dλ/dt )−0.58 at a high strain rate. A possible mechanism is proposed to interpret this phenomenon. It is believed this work provides new insight into the fracture behavior of hybrid DN gels.
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