Polypyrrole/Schiff Base Composite as Electromagnetic Absorbing Material with High and Tunable Absorption Performance

In recent years, Schiff base-related conjugated systems have received extensive attention, but little research has been done in the field of electromagnetic materials. In this work, an organic conjugated system based on polypyrrole/hydrazone Schiff base (PPy/HSB) composites was constructed via a Schiff base synthetic route and their electromagnetic behavior was investigated. The electromagnetic response of PPy/HSB complexes demonstrates fine electromagnetic absorption performance. When the filler loading is 30 wt% in a paraffin matrix, an absorption peak of -43.1 dB was achieved and its effective absorption bandwidth (EAB) was located in the range of 10.88-18.0 GHz. The electromagnetic response behavior of PPy/HSB complexes is explained by models involving electronic structure, multi-polarization and conductive network. The mechanisms of PPy/HSB complexes formation and HSB crystallization are also discussed through the compatibility of PPy/HSB and the structure of HSB. Moreover, the morphology transformation of HSB in the PPy/HSB systems has been studied. This study opens the exploration of organic-dielectric conjugated systems in the field of electromagnetic materials, and significantly broadens the application range of organic-dielectric-dielectric composites.

Automated summary

In this study, an organic conjugated system based on polypyrrole/hydrazone Schiff base composite was synthesized and its electromagnetic behavior was investigated. The results showed that the composite exhibited excellent electromagnetic absorption performance and the electromagnetic response behavior was explained by models. Additionally, the morphology transformation and formation mechanism of the composite were studied.