Recoverable and Self-healing Electromagnetic Wave Absorbing Nanocomposites

Dai, Xingyi, Du, Yuzhang, Yang, Jiye, Wang, Ding, Gu, Junwei, Li, Yifan, Wang, Steven, Xu, Ben Bin and Kong, Jie (2019) Recoverable and Self-healing Electromagnetic Wave Absorbing Nanocomposites. Composites Science and Technology, 174. pp. 27-32. ISSN 0266-3538

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Abstract

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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