A robust and self-healing elastomer achieved by a thio-β-diketone-Cu() coordination and H-bonding dual crosslinked system

Elastomers possessing good mechanical strength and self-healing capability are showing great importance in stretchable electronics, since they can play the role of robust substrates for devices, and prolong the service life of devices. However, it is hard to balance the trade-off between the high me...

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Bibliographic Details
Published in:Materials chemistry frontiers 2022-06, Vol.6 (13), p.1779-1787
Main Authors: An, Xiaoming, Liu, Jie, Zhang, Jia-Han, Huang, Xinxin, Zhu, Tangsong, Yan, Hongping, Jia, Xudong, Zhang, Qiuhong
Format: Article
Language:English
Subjects:
Bonding strength
Coordination
Diketones
Elastomers
Fine structure
Fracture strength
Hydrogen bonds
Pressure sensors
Reconfiguration
Robustness
Service life
Substrates
X ray absorption
X-ray scattering
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Summary:Elastomers possessing good mechanical strength and self-healing capability are showing great importance in stretchable electronics, since they can play the role of robust substrates for devices, and prolong the service life of devices. However, it is hard to balance the trade-off between the high mechanical strength and self-healing ability. Here we propose the synergetic strategy via combining thio-β-diketone-Cu 2+ metal-ligand (M-L) coordination with hydrogen bonds in one system, through which high mechanical strength, good elasticity and self-healing ability are achieved. The elastomer displays excellent mechanical performances (with a fracture strength of 4.35 MPa and a fracture strain of 3400%). Meanwhile, the elastomer can realize a high self-healing efficiency (94%) within only 3 hours at 80 °C. X-ray absorption fine structure (XAFS) analysis demonstrates the reconfiguration of M-L coordination at the molecular level, and small angle X-ray scattering (SAXS) during stretching demonstrates the microphase structure change of the polymer at the nanoscale level. Based on the elastomer, a self-healable pressure sensor and a self-healable strain sensor are fabricated. We report a novel elastomer possessing high stretchability, elasticity and self-healing ability, achieved by thio-β-diketone-Cu( ii ) coordination and H-bonding dual crosslinking. Flexible sensors are fabricated based on the elastomer.
ISSN:2052-1537
2052-1537
DOI:10.1039/d2qm00259k