Stress Relaxation and Underlying Structure Evolution in Tough and Self-Healing Hydrogels,ACS Macro Letters

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Stress Relaxation and Underlying Structure Evolution in Tough and Self-Healing Hydrogels
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-10-22 , DOI: 10.1021/acsmacrolett.0c00600
Kunpeng Cui ₁ , Ya Nan Ye ₂ , Chengtao Yu ₃ , Xueyu Li ₂ , Takayuki Kurokawa _{2,

4} , Jian Ping Gong _{1,

2,

4}

Affiliation

The tough and self-healing hydrogels composed of polyampholytes (PA gels) are drawing great attention due to their multiscale structures and the resultant multiple mechanical properties. This work studies the stress relaxation behavior of PA gels and reveals the underlying multiscale structure evolutions by combining birefringence and small-angle X-ray scattering measurements. The PA gels show a fast and strong stress relaxation that obeys the stress-optical rule, which could be associated with relaxation of chain segment orientation by the breaking of ionic bonds. A slow and weak relaxation of phase structure (∼100 nm) is also observed, which tells that the stress redistributes and local strain amplification gradually builds in the phase network at long relaxation times as a result of synergetic breaking of multiple ionic bonds. This work gives insight into exploring the formation of the crack precursor that is important in the fracture and fatigue of self-healing hydrogels.

中文翻译：

坚韧和自愈水凝胶中的应力松弛和基础结构演变

由聚两性电解质 (PA 凝胶) 组成的坚韧和自我修复的水凝胶由于其多尺度结构和由此产生的多种机械性能而备受关注。这项工作研究了 PA 凝胶的应力松弛行为，并通过结合双折射和小角 X 射线散射测量揭示了潜在的多尺度结构演变。PA凝胶表现出快速而强烈的应力松弛，符合应力-光学规则，这可能与离子键断裂导致链段取向松弛有关。还观察到相结构（~100 nm）缓慢而弱的弛豫，这表明由于多个离子键的协同断裂，应力重新分布和局部应变放大在长弛豫时间内逐渐建立在相网络中。

更新日期：2020-11-17

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