Abstract
A flexible multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) composite film was prepared via in situ polymerization followed by a facile blade coating process. An ultrahigh MWCNTs content of 48.1 wt% was obtained in this film, where MWCNTs without modification of acid or surfactant were uniformly dispersed in the WPU matrix. Therefore, the obtained film exhibited a high electrical conductivity of 16.67 S cm−1 and thermal conductivity of 5.31 W m−1 K−1. Moreover, an outstanding EMI SE of 65.3 dB at the frequency of 110 MHz was achieved with a film thickness of 80 μm, which can screen 99.9999% of incident wave at such frequency. The EMI shielding performance of this film is comparable to those of other polymer-based shielding composites with larger thickness (0.5–2 mm) ever reported. Furthermore, excellent flexibility and durability of composite films were demonstrated by bending test, indicating that it is a promising candidate for thermal conduction and EMI shielding of portable and wearable devices.
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Acknowledgements
The authors are grateful to the National Natural Science Foundation of China (Grant No. U1710115) and Youth Science Foundation of Shanxi Province (Grant No. 201901D211576) for their financial support of this study.
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Liu, W., Yao, T., Jia, K. et al. Flexible and thermal conducting multi-walled carbon nanotubes/waterborne polyurethane composite film from in situ polymerization for efficient electromagnetic interference shielding. J Mater Sci: Mater Electron 32, 4393–4403 (2021). https://doi.org/10.1007/s10854-020-05182-w
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DOI: https://doi.org/10.1007/s10854-020-05182-w