Investigating Temperature-Dependent Microscopic Deformation in Tough and Self-Healing Hydrogel Using Time-Resolved USAXS.

Autor: Chu Z; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China.; Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei, 230026, China., He K; Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei, 230026, China.; CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China.; Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China., Huang S; Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei, 230026, China.; CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China.; Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China., Zhang W; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China., Li X; Laboratory of Soft & Wet Matter, Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan., Cui K; Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei, 230026, China.; CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China.; Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.; Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Jazyk: angličtina
Zdroj: Macromolecular rapid communications [Macromol Rapid Commun] 2024 Oct; Vol. 45 (19), pp. e2400327. Date of Electronic Publication: 2024 Jun 12.
DOI: 10.1002/marc.202400327
Abstrakt: Tough and self-healing hydrogels are typically sensitive to loading rates or temperatures due to the dynamic nature of noncovalent bonds. Understanding the structure evolution under varying loading conditions can provide valuable insights for developing new tough soft materials. In this study, polyampholyte (PA) hydrogel with a hierarchical structure is used as a model system. The evolution of the microscopic structure during loading is investigated under varied loading temperatures. By combining ultra-small angle X-ray scattering (USAXS) and Mooney-Rivlin analysis, it is elucidated that the deformation of bicontinuous hard/soft phase networks is closely correlated with the relaxation dynamics or strength of noncovalent bonds. At high loading temperatures, the gel is soft and ductile, and large affine deformation of the phase-separated networks is observed, correlated with the fast relaxation dynamics of noncovalent bonds. At low loading temperatures, the gel is stiff, and nonaffine deformation occurs from the onset of loading due to the substantial breaking of noncovalent bonds and limited chain mobility as well as weak adaptation of phase deformation to external stretch. This work provides an in-depth understanding of the relationship between structure and performance of tough and self-healing hydrogels.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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