Preparation of a Microwave-Absorbing UV Coating Using a BaFe 12 O 19 -Polypyrrole Nanocomposite Filler.

BaFe 12 O 19 -polypyrrolenanocomposites were prepared via the in situ chemical oxidative polymerization of pyrrole monomers in the presence of BaFe 12 O 19 powder, with ammonium persulfate as an oxidant and sodium dodecyl benzene sulfonate as a dopant. X-ray diffraction measurements and Fourier-transform infrared spectroscopy indicated that there were no chemical interactions between BaFe 12 O 19 and polypyrrole. In addition, scanning electron microscopy showed that the composites exhibited a core-shell structure. Subsequently, the prepared nanocomposite was used as a filler to prepare a coating suitable for ultraviolet curing. The performance of the coating was investigated by evaluating its hardness, adhesion, absorbance, and resistance to acids and alkalis. Importantly, the addition of BaFe 12 O 19 -polypyrrole nanocomposites not only improved the coating hardness and adhesion but also produced a coating with a good microwave absorption performance. The results suggested that BaFe 12 O 19 /PPy composite has a lower reflection loss peak and a larger effective bandwidth at the X band when the proportion of the absorbent sample is 5-7%, when the absorption performance is the best. The reflection loss is in the range of 8.88-10.92 GHz below -10 dB.