Conductive polymers materials with hollow micro/nanostructure due to their special electrical properties and corrosion resistance have potential applications in microwave absorption, especially in marine environment. Herein, one-dimensional hollow conductive polypyrrole microtubes (H-PPyM) were prepared by in-situ polymerization of pyrrole monomer with methyl orange (MO) as soft template and FeCl3 as oxidant based on structural regulation strategy. The morphology and conductivity of H-PPyM can be easily controlled by adjusting the content proportion of MO. The results indicated that the surface morphology of polypyrrole changed from random granular to microtubular and the conductivity also gradually rose with the content increase of MO. When the content proportion of MO was 0.25 g, the obtained H-PPyM-0.25 composites possed notable microwave absorption capacity, simultaneously achieving ultrabroad effective absorption bandwidth (EAB, 6.7 GHz) and strong reflection loss value (RL, −33.6 dB) at a thickness of 2.6 mm with the filling content of only 10 wt%, respectively. Furthermore, the corresponding H-PPyM-0.25 products soaked in corrosive medium (3.5 wt% NaCl solution) for one month still displayed stable tubular hollow structure and excellent microwave absorption performance with RLmin of −43.8 dB and EAB of 6.2 GHz. The research results can not only help to understand the relationship among the morphology and microwave absorption of PPy, but also open a new avenue for preparing excellent seawater corrosion resistant microwave absorption materials.

中文翻译：

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空心导电聚吡咯微管作为微波吸收剂，具有良好的耐海水腐蚀性


具有中空微/纳米结构的导电聚合物材料由于其特殊的电性能和耐腐蚀性，在微波吸收方面具有潜在的应用前景，尤其是在海洋环境中。本文基于结构调控策略，以甲基橙 （MO） 为软模板，以 FeCl3 为氧化剂，通过吡咯单体原位聚合制备一维空心导电聚吡咯微管 （H-PPyM）。通过调整 MO 的含量比例，可以很容易地控制 H-PPyM 的形态和电导率。结果表明，聚吡咯的表面形貌由随机颗粒状转变为微管状，电导率也随着MO含量的增加而逐渐升高。当MO含量为0.25 g时，所制备的H-PPyM-0.25复合材料具有显著的微波吸收能力，在2.6 mm厚度下分别实现了超宽有效吸收带宽（EAB，6.7 GHz）和强反射损耗值（RL，−33.6 dB），填充含量仅为10 wt%。此外，相应的 H-PPyM-0.25 产品在腐蚀性介质（3.5 wt% NaCl 溶液）中浸泡 1 个月后，仍然表现出稳定的管状中空结构和优异的微波吸收性能，RLmin 为 −43.8 dB，EAB 为 6.2 GHz。研究结果不仅有助于理解PPy的形貌与微波吸收之间的关系，而且为制备优良的耐海水腐蚀微波吸收材料开辟了一条新的途径。