Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 19, Pages 7951-7961Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02136
Keywords
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Funding
- National Nature Science Foundation of China [51672133, U1737105]
- National Science Foundation of Jiangsu Province [BK20161496]
- Fundamental Research Funds for the Central Universities [30918012201]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_0287]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Self-healing polymers with microphase-separated structure are plagued with inferior self-healing efficiency at room temperature due to a lack of dynamic interactions in hard domains. Herein, we describe a novel strategy of multiphase active hydrogen bonds (H-bonds), toward realizing fast and efficient self-healing at room temperature, even under harsh conditions. The core conception is to incorporate thiourea moieties into microphase-separated polyurea network to form multistrength H-bonds, which destroy the crystallization of hard domains and, at the same time, insert the dynamic reversible H-bonds in both hard and soft segments, accounting for the surprisingly self-healing performances. The synthesized polymeric material, poly(dimethylsiloxane)-4,4'-methylenebis(phenyl isocyanate)-1,1'-thiocarbonyldiimidazole, completely recovers all of the mechanical properties within 4 h at room temperature after rupture. Significantly, self-healing process can also take place at low temperature (restoration with an 85% efficiency in 48 h at -20 degrees C) or in the water (restoration with a 95% efficiency in 4 h). Depending on the cleavage/reformation of multiphase H-bonds, the material exhibits unprecedented ultrastrechability and notch-insensitiveness. It can be stretched up to 31 500% without fracture and reach a notch-insensitive stretching of up to 18 000%. These exceptional characteristics inspired us to fabricate highly stretchable self-healable underwater conductor and protective self-healing film for suppressing shuttling of polysulfides and preventing crack propagation in S cathode, which provide the pathway for applications in underwater electronic devices or advanced Li-S batteries.
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