Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 174, Issue -, Pages 27-32Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2019.02.018
Keywords
Self-healing; Reprocessing; Recycling; Electromagnetic wave absorption; Dynamic covalent bonds
Categories
Funding
- National Natural Science Foundation of China [21875190, 21374089]
- Shaanxi Natural Science Funds for Distinguished Young Scholars [2018JC-008]
- Engineering and Physical Sciences Research Council (EPSRC) from UK [EP/N007921/1, EP/N032861/1]
- EPSRC [EP/N032861/1, EP/N007921/1] Funding Source: UKRI
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Recent advancements in electronics engineering require materials with the resiliency and sustainability to extend their life time. With this regard, we presented a sustainable multi-functional nanocomposites strategy by introducing dynamic imine bonds based polyazomethine (PAM) as molecular interconnects and Fe3O4-loaded multiwalled carbon nanotubes as electromagnetic (EM) wave absorbing units. Driven by the reversible dynamic imine bonds, our materials show robust spontaneous self-healing with excellent healing efficiencies of 95% for PAM and 90% for nanocomposite, and an accelerated recovery under a moderate mechanical stimulus. By adding Fe3O4-loaded multiwalled carbon nanotubes, the hybrids show excellent EM wave absorbing properties with 50% increment on minimum reflection coefficient (-40.6 dB) than the reported value. We demonstrate a full degradability by decomposing a nanocomposite sheet of 100 mg in an acidic solution within 90 min at room temperature. The nanofillers and monomers after degradation can be re-used to synthesis nanocomposites. The testing results for recoverable nanocomposites show a good retention on mechanical property. This novel strategy may shed a light on the downstream applications in EM wave absorbing devices and smart structures with great potential to accelerate circular economy.
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