Temperature- and Rate-Dependent Fracture in Disulfide Vitrimers,ACS Macro Letters

当前位置： X-MOL 学术 › ACS Macro Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Temperature- and Rate-Dependent Fracture in Disulfide Vitrimers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2024-07-25 , DOI: 10.1021/acsmacrolett.4c00241
Zhaoqiang Song ₁ , Gaoweiang Dong ₂ , Franck J Vernerey ₃ , Shengqiang Cai _{1,

2}

Affiliation

The fracture behaviors of disulfide vitrimers are highly rate-dependent. Our investigation revealed that the temperature-dependent fracture behaviors of disulfide vitrimers cannot be entirely explained by a simple time–temperature superposition model. This Letter explores the impact of the dynamic nature of molecular defects on the temperature- and rate-dependent fracture behaviors of disulfide vitrimers. Considering that the high cross-linking density remains constant during the associated bond exchange reaction, we identify loop defects in the network as the primary dynamic defects. By employing small amplitude oscillatory shear, we measured the loop defect fraction in EPS25 disulfide vitrimers at varied temperatures, revealing an increased presence of loop defects at elevated temperatures. Furthermore, our findings indicate that the temperature-dependent fracture behaviors are attributed to the temperature-dependent number of loop defects in disulfide vitrimers.

中文翻译：

二硫化物 Vitrimer 中温度和速率依赖性断裂

二硫化物玻璃体的断裂行为高度依赖于速率。我们的研究表明，二硫化物玻璃体的温度依赖性断裂行为不能完全用简单的时间-温度叠加模型来解释。这封信探讨了分子缺陷的动态性质对二硫化物玻璃体的温度和速率依赖性断裂行为的影响。考虑到在相关的键交换反应期间高交联密度保持恒定，我们将网络中的环缺陷确定为主要的动态缺陷。通过采用小振幅振荡剪切，我们测量了 EPS25 二硫化物玻璃体在不同温度下的环缺陷分数，揭示了在高温下环缺陷的存在增加。此外，我们的研究结果表明，温度依赖性断裂行为归因于二硫化物玻璃体中温度依赖性环缺陷数量。

更新日期：2024-07-25

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南