Abstract

Multifunctional electromagnetic interference (EMI) shielding materials are vital for the miniaturization and integration of electronic devices. In these applications, high shielding effectiveness (SE) and robust mechanical properties often determine the performance upper limits. However, conventional EMI shielding materials typically struggle to achieve both high SE and strong mechanical performance simultaneously. To address this challenge, we propose a "magnetic-bond dual-drive modulation" strategy to develop MXene/CNT/SmFeN (MCS)polyurethane (VPCDI) composite films (VPCDI@MCS) with exceptional EMI shielding and mechanical performance. The "magnetic drive" component enables ordered alignment of SmFeN magnetic moments, significantly enhancing complex permeability to boost shielding performance. Magnetized materials achieve an ultrahigh EMI SE of 66.5 dB in the X-band (8.2-12.4 GHz) with a Specific Shielding Effectiveness (SSE) of 2651 dB cm2 g-1. The "bond drive" component confers outstanding mechanical properties, including 1100 % elongation at break and 17.5 MPa tensile strength, while simultaneously demonstrating self-healing capability. The magnetic-bond synergistic driving strategy improves the overall performance simultaneously without sacrificing the performance of each individual component. This work provides a new strategy for the design of high-performance, multifunctional EMI shielding materials, opening up more possibilities for fields such as aerospace and military defense.

Keywords Plus: FABRICATION

Published in COMPOSITES PART B-ENGINEERING，Volume309；10.1016/j.compositesb.2025.113094，JAN 15 2026