Characterization, properties and mechanism of composite synthesized Eucommia ulmoides rubber and epoxy resin for electromagnetic interference shielding application

Synthesis of electromagnetic interference (EMI) shielding composites is the main strategy to solve the pollution of electromagnetic radiation. Herein, Mn0.6Zn0.4Fe2O4 (MZF) and carbon black (CB) were added into the emulsion made of Eucommia ulmoides rubber (EUR) and epoxy resin (EP) to prepare the MZF/CB/PEUR (EP@EUR) composites. The uniform distribution of CB created a conductive network that promoted abundant dipole polarization and conduction losses. In addition, the loading of the MZF imparted shielding mechanism of natural resonance and enhancement of conducting network for MZF/CB/PEUR composites that can optimize the complex dielectric constant, ulteriorly resulting in a high-level resonance peak (similar to 80.2 dB) in the 8.2-12.4 GHz frequency range. Based on the above series of filler loading experiments, the optimal loading concentration of CB (5%) and MZF (25%) was obtained. Finally, the excellent corrosion resistance of acid/alkali environments of MZF/CB/PEUR composites were further investigated. These results will provide a point of penetration for the development, application and mechanism research of EUR as a matrix for environment-friendly dielectricmagnetic EMI shielding composites.

Automated summary

The synthesis of electromagnetic interference (EMI) shielding composites is an effective strategy to combat electromagnetic radiation pollution. In this study, Mn0.6Zn0.4Fe2O4 (MZF) and carbon black (CB) were added to a emulsion made of Eucommia ulmoides rubber (EUR) and epoxy resin (EP) to prepare the MZF/CB/PEUR (EP@EUR) composites. The uniform distribution of CB created a conductive network that facilitated dipole polarization and conduction losses. Additionally, the inclusion of MZF provided a shielding mechanism through natural resonance and enhancement of the conducting network, resulting in an optimized complex dielectric constant and a high-level resonance peak in the 8.2-12.4 GHz frequency range. By conducting a series of filler loading experiments, the optimal loading concentrations of CB (5%) and MZF (25%) were determined. Furthermore, the MZF/CB/PEUR composites exhibited excellent corrosion resistance in acid/alkali environments. These findings contribute to the development, application, and mechanism research of environment-friendly dielectric-magnetic EMI shielding composites using EUR as a matrix.