期刊
INTERNATIONAL JOURNAL OF SMART AND NANO MATERIALS
卷 13, 期 4, 页码 575-596出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/19475411.2022.2116735
关键词
molecular motility; highly recoverable tough hydrogels; puncture resistance; molecular dynamics simulation
资金
- National Natural Science Foundation of China [51873064, 51603068, 11772283]
- Natural Science Foundation of Shanghai [20ZR1418200, 17ZR1440600]
This study reports a molecular movement mechanism based on trehalose that accelerates the kinetics of hydrogen-bonding interaction, leading to a hydrogel with high toughness and rapid recoverability.
It remains a challenge to achieve rapidly recoverable hydrogels by molecular hydrogen-bonding interaction because of its slow interaction kinetics. This work for the first time reports a trehalose (Tre)-based molecular movement mechanism inside a single network of polyacrylamide (PAM) that accelerates the kinetics of hydrogen-bonding interaction, and thereby endows the hydrogel with high toughness and rapid shape and mechanical recoverability. The resultant PAM@Tre hydrogel is capable of full shape recovery after 10,000 loading/unloading cycles at a strain of 500%. Even after being stretched at a strain of 2500%, it can recover to its original shape within 10 seconds. Moreover, the molecular movement of trehalose also endows the PAM@Tre hydrogel with fracture energy and toughness as high as similar to 9000 J m(-2) and similar to 1600 kJ m(-3), respectively, leading to strong resistance to both static and dynamic piercing. The PAM@Tre hydrogel is thus believed to have enormous potentials in protection devices, bionic skin, soft actuator, and stretchable electronics. [GRAPHICS] .
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