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, 866–873DOI: 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.
Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal
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%.
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