Recoverable and self-healing electromagnetic wave absorbing nanocomposites
Recoverable and self-healing electromagnetic wave absorbing nanocomposites
复制标题
可恢复和自修复的电磁波吸收纳米复合材料
DOI：
10.1016/j.compscitech.2019.02.018
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发表时间：
2019-04-12
影响因子：
9.1
通讯作者：
Kong, Jie
中科院分区：
文献类型：
--
作者：
Dai, Xingyi;Du, Yuzhang;Kong, Jie
电子工程的最新进展需要具有弹性和可持续性的材料来延长其使用寿命。为此，我们提出了一种可持续的多功能纳米复合材料策略，引入基于动态亚胺键的聚甲亚胺（PAM）作为分子互连，并引入负载Fe3O4的多壁碳纳米管作为电磁（EM）波吸收单元。在可逆动态亚胺键的驱动下，我们的材料表现出强大的自发自修复能力，PAM 的修复效率高达 95%，纳米复合材料的修复效率高达 90%，并且在适度的机械刺激下加速恢复。通过添加负载 Fe3O4 的多壁碳纳米管，该杂化材料表现出优异的电磁波吸收性能，最小反射系数（-40.6 dB）比报道值增加了 50%。我们通过在室温下的酸性溶液中 90 分钟内分解 100 毫克的纳米复合材料片材来证明其完全可降解性。降解后的纳米填料和单体可以重新用于合成纳米复合材料。可恢复纳米复合材料的测试结果显示其机械性能保持良好。这种新颖的策略可能会揭示电磁波吸收装置和智能结构的下游应用，具有加速循环经济的巨大潜力。
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.