期刊
COMPOSITES PART B-ENGINEERING
卷 229, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109460
关键词
Wood-based material; MXene; Densification; EMI shielding; Flame retardancy; Mechanical properties
资金
- National Natural Science Foundation of China [32071684, 31670561]
- Talent Startup Project of Scientific Research and Development Foundation of Zhejiang AF University [2020FR022]
A flexible MXene/wood composite with sandwich structure was constructed for EMI shielding application, showing excellent mechanical properties and electromagnetic shielding effectiveness.
Due to the increasingly severe electromagnetic pollution, the green, lightweight, and high-performance electromagnetic interference (EMI) shielding materials need to be urgently developed. However, there are still challenges in constructing biomass-based high-performance electromagnetic shielding materials through uncomplicated methods. Herein, a flexible MXene/wood composite (F-MWC) with sandwich structure was constructed for EMI shielding application based on MXene and delignified wood via impregnation and densification process. The resultant F-MWC shows the mechanical properties with a tensile strength of 68.1 MPa, and excellent flexibility compared with natural wood due to the thinner thickness and highly aligned cellulose nanofibers. It also shows remarkable fire-retardant properties with a self-extinguishing effect attributed to the synergistic effect of MXene's flame retardancy and densification treatment. Moreover, F-MWC possessed a high electrical conductivity of 1858 S m(-1) and excellent EMI-shielding effectiveness of 32.7 dB at a thickness of only 0.38 mm. In addition, the multilayered MXene/wood composite assembled by cross-combining F-MWC along the fiber direction with better EMI-shielding effectiveness and strength makes it more scalable in applications. This technique provides an alternate strategy for producing wood-based EMI shielding materials for electronic devices, packaging, and modern buildings.
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