Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels

You-Cai Xue; Yi-Ming Yang; Di Jia

doi:10.1007/s10118-024-3116-6

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Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels

RESEARCH ARTICLE | Updated：2024-08-27

- Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels
- Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels
- 高分子科学（英文版） 2024年42卷第9期页码：1360-1367
- Affiliations：
  
  a.Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  jiadi11@iccas.ac.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 22273114), the National Key R&D Program of China (No. 2023YFE0124500), the National Key R&D Program of China (No. 2023YFC2411203) and International Partnership Program of the Chinese Academy of Sciences (No. 027GJHZ2022061FN).
- DOI：10.1007/s10118-024-3116-6
  中图分类号：
- 收稿：2024-01-24，
  
  修回：2024-02-16，
  
  录用：2024-02-29，
  
  网络首发：2024-03-29，
  
  纸质出版：2024-09-01
- Accepted：
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Xue, Y. C.; Yang, Y. M.; Jia, D. Interplay between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels. Chinese J. Polym. Sci. 2024, 42, 1360–1367

You-Cai Xue, Yi-Ming Yang, Di Jia. Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels[J]. Chinese Journal of Polymer Science, 2024, 42(9): 1360-1367.
Xue, Y. C.; Yang, Y. M.; Jia, D. Interplay between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels. Chinese J. Polym. Sci. 2024, 42, 1360–1367 DOI： 10.1007/s10118-024-3116-6.

You-Cai Xue, Yi-Ming Yang, Di Jia. Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels[J]. Chinese Journal of Polymer Science, 2024, 42(9): 1360-1367. DOI： 10.1007/s10118-024-3116-6.

摘要

The relationship between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels was studied and found that the dynamical association-dissociation of the ionic bonds

occurring only at intermediate ionic strength

can induce the solid-liquid transition at low frequency and self-healing properties in the yielding measurements.

Abstract

Polyampholyte gels

which have hierarchical structures

exhibit excellent self-healing properties and have great promise for biomaterials and bioengineering. We investigated the relationship between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels and found three factors influencing their viscoelastic properties

including the chemical crosslinking bonds

topological entanglements controlled by monomer concentration

and the ionic bonds. Ionic strength plays a major role on the strength of ionic bonds. A crossover point of elastic modulus and loss modulus was observed in the dynamic frequency sweeps at low monomer concentration or low chemical crosslinking density for gels with intermediate strength of ionic bonds. The solid-liquid transition signaled by the crossover point is a typical feature of dynamic associated gels

representing the dynamical association-dissociation of the ionic bonds and full relaxation of the topological entanglements in the gel network. While the crossover point disappears when the ionic bonds are too weak or too strong to form “permanent” bonds. Consistently

in the non-linear yielding measurement

gels with intermediate strength of the ionic bonds are ductile and yield at very large shear strain due to the self-healing properties and the dynamic association-dissociation of the ionic bonds. But the self-healing properties disappear when the ionic bond strength is too weak or too strong. Our work reveals the mechanism of how the dynamic association-dissociation of ionic bonds influences both the linear and non-linear viscoelastic properties of the polyampholyte gels.

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