One-step Synthesis of Three-dimensional Rod-like Polypyrrole and Investigation for Microwave Absorption Performance
CHENG Yajie1,2, XU Zichen1,2,3, WANG Qiang1,2,3,*, WEI Hao1,2,3, SUN Xiping1,2, WANG Lin1,2
1 Qingdao Innovation and Development Center, Harbin Engineering University, Qingdao 266000, Shandong, China 2 Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao 266000, Shandong, China 3 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Abstract: This study addresses the issues of monotonous microscopic morphology and impedance mismatch inherent in traditional polypyrrole microwave absorption materials. Four distinct microstructures of polypyrrole (PPy-X) were fabricated by manipulating the polymerization conditions and employing a one-step synthesis approach. Subsequently, their dielectric parameters were assessed using the coaxial method, enabling subsequent calculation of their microwave absorption performance. The research findings reveal that polypyrrole prepared with MnO2 as the oxidant and methyl orange as the surfactant (PPy-C) exhibits optimal microwave absorption performance. The optimum reflection loss at a sample thickness of 2.5 mm reaches -28.97 dB (11.20 GHz), and the effective absorption bandwidth (EAB) extends to 4.32 GHz (6.88—11.2 GHz) at 3 mm. The exceptional absorption characteristics of PPy-C stem from impedance matching and polarization loss. Its favorable impedance matching properties are attributed to the utilization of MnO2 as the oxidant and methyl orange as the surfactant in the oxidation process. The pola-rization loss of PPy-C arises from two primary aspects: the introduction of dipoles through methyl orange doping, resulting in dipole polarization; the synergistic effect of multiple interfaces between the three-dimensional rod-like structure of PPy-C and the nanoscale particles enhances the material′s interface polarization. The microstructure modulation strategy employed for polypyrrole proficiently fine-tunes the loss mechanisms of electromagnetic waves within the material, leading to superior microwave absorption performance.
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2025, Vol. 39 
