Abstract
Simple and efficient preparation methods and structural designs broaden the synthetic paths and absorption performance of electromagnetic wave absorbing materials. In this paper, a soap-free lotion polymerization method and a seed polymerization method were used to prepare three-layer composite microspheres with polymethyl methacrylate (PMMA) as the seed and divinylbenzene (DVB) and (AN) acrylonitrile as the coating monomers. PMDA after carbonization at 700 ℃ has good electromagnetic wave absorption (EMWA) performance. When the matching thickness is 2.48 mm, the minimum reflection loss (RLmin) is −52.05 dB at 12.85 GHz. At a matching thickness of 2 mm, the maximum effective absorption bandwidth (EAB) of 4.80 GHz is obtained. The advantages are attributed to the synergistic effect of heteroatom doping, hollow morphology and porous structure, resulting in dipole polarization, multi-interface polarization, multiple reflection and scattering, impedance matching and conduction loss. Simple and effective manufacturing method, the surface microstructure and the material composition provide a new strategy for improving the EMWA efficiency of the absorber.
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