Structure‐function integrated design of electromagnetic interference shielding and mechanical properties of <scp>2D</scp> carbon fiber reinforced polymer composites based on absorption loss regulation

Abstract Carbon fiber reinforced polymer (CFRP) composites integrating structure and electromagnetic interference (EMI) shielding are gaining interest. This paper uses silane coupling agent KH570 modified Nano‐ZnO to enhance the EMI shielding of 2D carbon fiber cloths (CFC). Boron‐phenolic resin (BPF) was modified by KH570 modified carbonyl iron powder (CIP). The ZnO 2 @CF/CIP 2 @BPF composite, modified with 0.4 wt% Nano‐ZnO and 10 wt% CIP, achieves an average EMI SE of 52.72 dB and low transmittance in the X‐band, while significantly improving mechanical properties (Interlayer shear strength by 74.11%, flexural strength by 80.32%, and flexural modulus by 61.07%) compared to the original CF/BPF composite. The composite's electromagnetic shielding properties and mechanical properties make it potentially valuable in military and civilian applications. Highlights Enhanced EMI shielding with Nano‐ZnO coated carbon fibers. Modified boron phenolic resin matrix for improved absorption. Composites exhibits superior EMI shielding and mechanical properties. Synergistic surface and matrix modification boosts composite overall performance. Carbon fiber composite achieves 52.72 dB EMI shielding efficacy.