Journal
POLYMERS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/polym10050474
Keywords
self-healing; epoxy coating; MXene; Diels-Alder reaction; photothermal effect
Categories
Funding
- Scientific Research Foundation for Returned Scholars [ZX15504320001]
- National Natural Science Foundation of China [51503098]
- Preferred Program Foundation for Returned Scholars [ZX15512320008]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD), Qing Lan Project, Six Talent Peaks Project in Jiangsu Province [XCL-029]
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Two issues are required to be solved to bring intrinsically self-healing polymer coatings into real applications: remote activation and satisfied practical properties. Here, we used MXene, a newly reported two-dimensional material, to provide an epoxy coating with light-induced self-healing capabilities and we worked to enhance the properties of that coating. The self-healing coatings had a reversible crosslinking network based on the Diels-Alder reaction among maleimide groups from bis(4-maleimidopheny)methane and dangling furan groups in oligomers that were prepared through the condensation polymerization of diglycidylether of bisphenol A and furfurylamine. The results showed that the delaminated MXene flakes were small in size, around 900 nm, and dispersed well in self-healing coatings. The MXene flakes of only 2.80 wt % improved greatly the pencil hardness of the coating hardness from HB to 5H and the polarization resistance from 4.3 to 428.3 M cm(-2). The self-healing behavior, however, was retarded by MXene flakes. Leveling agent acted a key part here to facilitate the gap closure driven by reverse plasticity to compensate for the limitation of macromolecular mobility resulting from the MXene flakes. The self-healing of coatings was achieved in 30 s by thermal treatment at 150 degrees C. The efficient self-healing was also demonstrated based on the recovery of the anti-corrosion capability. MXene flakes also played an evident photothermal role in generating heat via irradiation of near-infrared light at 808 nm and focused sunlight. The healing can be quickly obtained in 10 s under irradiation of near-infrared light at 808 nm having a power density of 6.28 W cm(-2) or in 10 min under irradiation of focused sunlight having a power density of 4.0 W cm(-2).
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