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Multifunctional cellulose composite films with dual-continuous CNT/BN networks for synchronously enhanced electromagnetic interference shielding ability and thermal conductivity

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Abstract

Multifunctional materials with high electromagnetic interference (EMI) shielding effectiveness and thermal conductivity (TC) are an essential guarantee for the rapid advancement of next-generation electronic products. Herein, the three-dimensional porous conductive/thermal network of carbon nanotubes (CNT)/cellulose is prefabricated by “solution-gelation-solvent exchange-freeze drying”. Using “impregnation and high-pressure compression molding”, CNT/cellulose-boron nitride/polyvinyl alcohol (CNT/cellulose-BN/PVA) composite films with three-dimensional dual-continuous network structure are constructed to provide a perfect pathway for both electrons and phonons transportation. Comprehensive performance of the composites before and after hot-pressing including the microstructure, electrical conductivity, EMI shielding and thermal conductivity is investigated. Benefiting from the high-pressure compression molding process, the composite is densified and a close contact between fillers is achieved, which effectively improves the electrical and thermal conductivity. The finally obtained CNT/cellulose-BN/PVA composite film exhibits satisfactory EMI shielding performance, high in-plane and cross-plane TC, as well as excellent Joule heating performance, demonstrating enormous potential as high-performance EMI shielding and thermal management materials in practical applications. The significance of this work is to give an inspiration for improving the comprehensive performance of electromagnetic shielding and thermal conductive materials.

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Acknowledgments

The authors gratefully acknowledge the National Natural Science Foundation of China (52103127), the Natural Science Basic Research Program of Shaanxi (No. 2021JQ-564), the Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) (No. sklpme2022-4-10), the China Postdoctoral Science Foundation (2022T150512), the Natural Science Basic Research Program of Shaanxi Province (No. 2021JC-48).

Funding

This work was supported by funds from the National Natural Science Foundation of China (52103127), the Natural Science Basic Research Program of Shaanxi (No. 2021JQ-564), the Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) (No. sklpme2022-4–10), the China Postdoctoral Science Foundation (2022T150512), the Natural Science Basic Research Program of Shaanxi Province (No. 2021JC-48).

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All authors contributed to the study conception and design. Material preparation, data collection, analysis, and writing-original draft were performed by LZ and FZ. Conceptualization and wring-review and editing were performed by QS, ZZ, SY and DY. Supplemental tests and analysis in revision of the manuscript and Supporting Information were performed by LZ, FZ, LP and XZ. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Liang-Qing Zhang.

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Zhang, LQ., Zhou, F., Shi, Q. et al. Multifunctional cellulose composite films with dual-continuous CNT/BN networks for synchronously enhanced electromagnetic interference shielding ability and thermal conductivity. Cellulose 31, 2397–2412 (2024). https://doi.org/10.1007/s10570-024-05767-2

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