Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal

Rong-Ze Gao; Yu-Xi Li; Jian-Hui Yan; Xue-Rui Ma; Xu-Ming Xie

doi:10.1007/s10118-022-2874-2

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Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal

RESEARCH ARTICLE | Updated：2023-05-26

- Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal
- Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal
- 高分子科学（英文版） 2023年41卷第6期页码：866-873
- Affiliations：
  
  Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Author bio：
  
  xxm-dce@mail.tsinghua.edu.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 52273023, 21774069, 51633003 and 21474058).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-022-2874-2.
- DOI：10.1007/s10118-022-2874-2
  中图分类号：
- 收稿：2022-08-16，
  
  修回：2022-9-18，
  
  录用：2022-9-19，
  
  网络首发：2022-11-18，
  
  纸质出版：2023-06-01
- Accepted：
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Gao, R. Z.; Li, Y. X.; Yan, J. H.; Ma, X. R.; Xie, X. M. Super tough hydrogels with self-adaptive network facilitated by liquid metal. Chinese J. Polym. Sci. 2023, 41, 866–873

Rong-Ze Gao, Yu-Xi Li, Jian-Hui Yan, et al. Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal[J]. Chinese Journal of Polymer Science, 2023, 41(6): 866-873.
Gao, R. Z.; Li, Y. X.; Yan, J. H.; Ma, X. R.; Xie, X. M. Super tough hydrogels with self-adaptive network facilitated by liquid metal. Chinese J. Polym. Sci. 2023, 41, 866–873 DOI： 10.1007/s10118-022-2874-2.

Rong-Ze Gao, Yu-Xi Li, Jian-Hui Yan, et al. Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal[J]. Chinese Journal of Polymer Science, 2023, 41(6): 866-873. DOI： 10.1007/s10118-022-2874-2.

摘要

In this article

poly(acrylic acid) hydrogels cross-linked by liquid metal with self-adaptive networks are fabricated. Liquid metal can act as dynamic cross-linking points. By stretching

one LM droplet may change its shape or break into more and smaller droplets to form new crosslinking points

thus the hydrogel networks are self-adapted and enhanced.

Abstract

Liquid metals (LM) refer to Ga-based alloys with low melting points such as Eutectic GaInSn alloys (EGaInSn)

which have excellent fluidity

flexibility and low toxicity at room temperature. In this work

by incorporating EGaInSn into poly(acrylic acid) (PAA) hydrogels as dynamic crosslinkers and effective energy-dissipating units

tough and strong PAA-LM hydrogels are prepared through the interactions between the oxide layers on the surface of LM and carboxyl groups of PAA chains. Moreover

owing to the fluidity of LM

one LM droplet as a cross-linking point may change its shape or break into more and smaller droplets in the hydrogels upon stretching. Then hydrogels with self-adaptive networks can be fabricated by mechanical training through cyclic stretch at a certain elongation. Thus

the networks of the hydrogels are further homogenized

and the hydrogels are significantly toughened during the training due to the increased cross-linking density from the larger number of smaller LM droplets. After a 5-cycle training at the maximum strain of 500% and 24 h recovering

the tensile strength and initial modulus of the PAA-LM hydrogels can be increased from 355 kPa to 597 kPa and 71 kPa to 166 kPa

respectively

while the elongation at break only decreases from 1491% to 1034%.

关键词

Keywords

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