Structure-Function Integrated Design of Electromagnetic Interference Shielding and Mechanical Properties of 2d Carbon Fiber Reinforced Polymer Composites Based on Absorption Loss Regulation

Abstract

Carbon fiber reinforced polymer (CFRP) composites with integrated structure and function are becoming a trend to pursue high-efficiency electromagnetic interference shielding (EMI) performance while maintaining their excellent characteristics as structural materials. In this paper, three dielectric coatings with different zinc contents were prepared on the surface of the fibers by using the silane coupling agent KH570 modified nanostructured zinc oxide particles (Nano-ZnO) to regulate the electromagnetic properties of 2D carbon fiber cloths (CFC), and the CFC with 0.4 wt% Nano-ZnO (ZnO2@CF) content were selected to prepare the final laminates. In addition, Boron-phenolic resin(BPF)was modified by KH570 modified carbonyl iron powder (CIP). Dielectric loss, magnetic loss and conductivity loss work together to attenuate the electromagnetic wave through four loss cycles. The ZnO2@CF/CIP2@BPF composite modified with 0.4 wt% Nano-ZnO and 10 wt% CIP achieves excellent EMI shielding performance at an average EMI shielding efficacy (SE) of 52.72 dB and extremely low transmittance of 5.61×10-6 in the X-band frequency range. At the same time, the interlaminar shear strength (ILSS) reaches 25.02 MPa, which is 74.11% higher than that of the original CF/BPF composite, and the flexural strength and flexural modulus reach 304.19 MPa and 34.93 GPa, respectively, which are increased by 80.32% and 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.

Keywords: CF coating modification, Resin matrix modification, Structure-function integration, EMI shielding, Mechanical Properties