Abstract
To impart polymers with high electrical conductivity and satisfactory electromagnetic interference shielding efficiency, it is crucial to efficiently construct interconnecting networks of conductive nanofillers in polymer matrices. Herein, on the basis of the three-dimensional (3D) skeleton and volume-exclusion effect of silane-modified tetra-needle ZnO (ST-ZnO) whiskers and the high conductivity of two-dimensional MXene nanosheets, multifunctional MXene/ST-ZnO/waterborne polyurethane (MTW) nanocomposite films are fabricated by coating of MXene on ST-ZnO followed by compounding with waterborne polyurethane. The 3D four-needles of the whiskers facilitate the formation of an interconnecting network in the waterborne polyurethane matrix, while the coating of MXene efficiently makes the interconnecting network of the whiskers conductive at a low amount of the MXene. The resultant MTW ternary nanocomposite film exhibits not only a high electrical conductivity of 4.8×104 S/m, but also an excellent electromagnetic interference shielding effectiveness of over 70 dB in the X-band at a low thickness of 100 µm. In addition, the ternary film also exhibits outstanding Joule heating performances with an equilibrium temperature of 113 °C at a low driving voltage of 3 V. The multifunctional nanocomposite films are promising for applications in portable and wearable electronics and flexible electromagnetic interference shielding devices.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51922020 and 52090034), and the Fundamental Research Funds for the Central Universities (Nos. BHYC1707B and XK1802-2).
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Multifunctional Waterborne Polyurethane Nanocomposite Films with Remarkable Electromagnetic Interference Shielding, Electrothermal and Solarthermal Performances
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Xu, MK., Luo, XJ., Zhang, HB. et al. Multifunctional Waterborne Polyurethane Nanocomposite Films with Remarkable Electromagnetic Interference Shielding, Electrothermal and Solarthermal Performances. Chin J Polym Sci 41, 267–277 (2023). https://doi.org/10.1007/s10118-022-2813-2
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DOI: https://doi.org/10.1007/s10118-022-2813-2