Amplification of integrated microscopic motions of high-density [2]rotaxanes in mechanically interlocked networks

Xue Yang, Lin Cheng, Zhaoming Zhang, Jun Zhao, Ruixue Bai, Zhewen Guo, Wei Yu () and Xuzhou Yan ()
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Xue Yang: Shanghai Jiao Tong University
Lin Cheng: Shanghai Jiao Tong University
Zhaoming Zhang: Shanghai Jiao Tong University
Jun Zhao: Shanghai Jiao Tong University
Ruixue Bai: Shanghai Jiao Tong University
Zhewen Guo: Shanghai Jiao Tong University
Wei Yu: Shanghai Jiao Tong University
Xuzhou Yan: Shanghai Jiao Tong University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Integrating individual microscopic motion to perform tasks in macroscopic sale is common in living organisms. However, developing artificial materials in which molecular-level motions could be amplified to behave macroscopically is still challenging. Herein, we present a class of mechanically interlocked networks (MINs) carrying densely rotaxanated backbones as a model system to understand macroscopic mechanical properties stemmed from the integration and amplification of intramolecular motion of the embedded [2]rotaxane motifs. On the one hand, the motion of mechanical bonds introduces the original dangling chains into the network, and the synergy of numerous such microscopic motions leads to an expansion of entire network, imparting good stretchability and puncture resistance to the MINs. On the other hand, the dissociation of host−guest recognition and subsequent sliding motion represent a peculiar energy dissipation pathway, whose integration and amplification result in the bulk materials with favorable toughness and damping capacity. Thereinto, we develop a continuous stress-relaxation method to elucidate the microscopic motion of [2]rotaxane units, which contributes to the understanding of the relationship between cumulative microscopic motions and amplified macroscopic mechanical performance.

Date: 2022
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DOI: 10.1038/s41467-022-34286-6

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