Progressive conductivity modular assembled fiber reinforced polymer composites for absorption dominated ultraefficient electromagnetic interference shielding

Mechanical strong and durable fiber reinforced polymer composites (FRPC) with adjustable electromagnetic interference (EMI) shielding performance are urgently needed due to the rapid growing of electronics in civil and military fields. However, regulating the electromagnetic feature of fiber reinforced resin composites for tunable and absorption-dominated EMI shielding performance is still a great challenge due to the fixed electromagnetic properties of the continuous fabrics. Herein, an ultraefficient fiber reinforced epoxy resin EMI shielding com-posite with extremely low reflection, adjustable electromagnetic shielding feature and strong mechanical properties is fabricated through a facile progressively conductive fabric modular assembly. By decorating elec-tromagnetic particles to obtain customized electromagnetic functional fiber cloths and progressively conductive modular design, this multi-layered fiber reinforced epoxy resin composites enable the arbitrary regulation of the electromagnetic wave reflection and absorption capabilities, leading to an excellent average EMI shielding effectiveness of 78.6 dB and extremely low reflectivity (R) of 0.05 in X-band frequency range. In addition, benefitting from the reasonable fabric arrangement and asymmetric layered structure, the composite also ex-hibits excellent mechanical properties. The tensile strength is 283.1 MPa, and the energy absorption reached 15.9 J under the impact of 20 J. Our work demonstrated that this progressive conductivity modular assembly is a reliable and efficient strategy to develop highly efficient EMI shielding FRPC composites with adjustable and absorption-dominated shielding feature, and is highly promising for applications in next-generation electronic devices.

Automated summary

This study develops a fiber reinforced epoxy resin composite with adjustable electromagnetic shielding performance and strong mechanical properties by a facile progressively conductive fabric modular assembly. The composite allows arbitrary regulation of electromagnetic wave reflection and absorption capabilities, achieving excellent EMI shielding effectiveness and extremely low reflectivity. Additionally, the composite demonstrates outstanding mechanical properties due to the reasonable fabric arrangement and asymmetric layered structure. This research provides a reliable and efficient strategy for developing highly efficient EMI shielding FRPC composites with adjustable and absorption-dominated shielding feature, showing great potential for next-generation electronic devices.