Research of NBR/G@Fe3O4 electromagnetic shielding composites

The NBR/G@Fe 3 O 4 composites with good electromagnetic shielding properties are prepared by solution blending, previously, the “G@Fe 3 O 4 composite particles” were obtained by a simple co-precipitation method. The structures of G@Fe 3 O 4 are characterized by Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy (Raman), Scanning electron microscopy (SEM), and the graphene content in the composite particles was analyzed by thermogravimetric analysis (TGA). The electromagnetic shielding performance of NBR composites is tested by microwave vector network analyzer. The results show that the average electromagnetic shielding effectiveness of NBR/G@Fe 3 O 4 composites in X-band (8.2–12.4 GHz) can reach 80.4dB, and when the thickness is only 2.1 mm and the filler content is 15 phr can reach 28.2dB, which shield 96.2% of the energy of incident electromagnetic waves. Due to the introduction of magnetic particle Fe 3 O 4 , the NBR/G@Fe 3 O 4 composites have better shielding performance than NBR/G composites at the same graphene content. The electromagnetic shielding effectiveness of NBR/G@Fe 3 O 4 composites with 9.3 phr of graphene is basically the same as that of NBR/G composites with 12.4 phr of graphene.