Enhanced mechanical and dielectric properties of Aramid fiber/Mica-nanofibrillated cellulose composite paper with biomimetic multilayered structure
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The application of Aramid/mica composite paper in high-voltage electric insulation is hampered by its limited breakdown strength and mechanical robustness. In this work, Aramid fiber/Mica-NFC composite papers with varied amount of nanofibrillated cellulose (NFC) were fabricated by vacuum-assisted self-assembly process, wherein NFC was used as carrier/adhesion polymer. The Aramid fiber/Mica-NFC composite papers exhibited high mechanical strength (~ 29.04 MPa), superior dielectric properties (~ 14.87 kV/mm) and good thermal stability (~ 300 °C). Importantly, NFC acts as interfacial layer since the physical properties of NaOH-Urea treated Aramid/Mica-NFC composite significantly decreased. Based on visualization of NFC by fluorescence tracking, the addition of NFC favors the formation of biomimetic multilayer structure. Furthermore, the co-continuous double-network-like multilayer structured composite achieved an integrated strong and tough character. Therefore, our work shed light on the importance of constructing rational-designed microstructures for the preparation of high-performance composite papers.
KeywordsBiomimetic nanocomposites Nanofibrillated cellulose Multilayered structure Mechanical property Dielectric property
The authors would like to acknowledge the financial support from the National Key Research and Development Plan (2017YFB0308300), Shaanxi Province Supporting Plan for Innovative Research (2017-KCT-02), the National Natural Science Foundation of China (Grant No. 21704058), State Key Laboratory of Pulp and Paper Engineering (Project No. 201727) and Key Laboratory Research Project of Shaanxi Education Department (Project No. 18JS011).
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