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Elucidating Nonlinear Stress Relaxation in Transient Networks through Two-Dimensional Rheo-Optics
ACS Macro Letters ( IF 5.1 ) Pub Date : 2024-08-21 , DOI: 10.1021/acsmacrolett.4c00338 Yuta Yamamoto 1 , Yoshifumi Yamagata 2 , Taisuke Sato 3 , Koshiro Nakamura 1 , Ren Sato 1 , Mitsuru Naito 4 , Ung-Il Chung 1, 5 , Takuya Katashima 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2024-08-21 , DOI: 10.1021/acsmacrolett.4c00338 Yuta Yamamoto 1 , Yoshifumi Yamagata 2 , Taisuke Sato 3 , Koshiro Nakamura 1 , Ren Sato 1 , Mitsuru Naito 4 , Ung-Il Chung 1, 5 , Takuya Katashima 1
Affiliation
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This study aims to elucidate the origin of nonlinear stress relaxation behaviors in transient networks using a systematically controlled model system consisting of the tetra-armed polyethylene glycols (Tetra-PEG slime) in conjunction with two-dimensional rheo-optics observations. Transient networks, characterized by their temporary cross-links, are extensively utilized in self-healing and robust materials. However, the molecular mechanisms governing their viscoelastic responses to large deformations have remained elusive. This is primarily due to the heterogeneous structures inherent in conventional transient networks and a scarcity of detailed experimental evaluations. By employing Tetra-PEG slime, which is distinguished by its regular structure with uniform strand lengths and functionalities, and the polarization imaging method, we overcome these obstacles. Our results reveal that the damping phenomena observed under large step strains arise from spatially heterogeneous relaxation, predominantly driven by network strand pullout. These insights lay a solid foundation for understanding the intricate rheological properties of transient networks.
中文翻译：
通过二维流变光学阐明瞬态网络中的非线性应力松弛
本研究旨在利用由四臂聚乙二醇（Tetra-PEG slime）组成的系统控制模型系统并结合二维流变光学观察，阐明瞬态网络中非线性应力松弛行为的起源。瞬态网络以其临时交联为特征，广泛应用于自修复和坚固的材料中。然而，控制它们对大变形的粘弹性响应的分子机制仍然难以捉摸。这主要是由于传统瞬态网络固有的异构结构以及缺乏详细的实验评估。通过采用 Tetra-PEG 粘液（其具有均匀的链长度和功能的规则结构）以及偏振成像方法，我们克服了这些障碍。我们的结果表明，在大阶跃应变下观察到的阻尼现象源于空间异质松弛，主要由网络链拉拔驱动。这些见解为理解瞬态网络复杂的流变特性奠定了坚实的基础。
更新日期：2024-08-21
中文翻译：
通过二维流变光学阐明瞬态网络中的非线性应力松弛
本研究旨在利用由四臂聚乙二醇（Tetra-PEG slime）组成的系统控制模型系统并结合二维流变光学观察，阐明瞬态网络中非线性应力松弛行为的起源。瞬态网络以其临时交联为特征，广泛应用于自修复和坚固的材料中。然而，控制它们对大变形的粘弹性响应的分子机制仍然难以捉摸。这主要是由于传统瞬态网络固有的异构结构以及缺乏详细的实验评估。通过采用 Tetra-PEG 粘液（其具有均匀的链长度和功能的规则结构）以及偏振成像方法，我们克服了这些障碍。我们的结果表明，在大阶跃应变下观察到的阻尼现象源于空间异质松弛，主要由网络链拉拔驱动。这些见解为理解瞬态网络复杂的流变特性奠定了坚实的基础。
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