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Sustainable cellulose nanocrystal based hydrophobic coatings with excellent self-cleaning and high thermal stability for multi-scenario applications
作者:Aiping Zhan , Somia Yassin Hussain Abdalkarim , Hou-Yong Yu
關鍵字:Cellulose nanocrystals, Hydrophobic coatings, Hydrophobicity, Thermal stability
論文來源:期刊
具體來源:https://doi.org/10.1016/j.indcrop.2023.117382
發表時間:2023年
Paper-based packaging is widely applied for reducing the application of nonbiodegradable fossil-based polymers because of the growing environmental problems. However, paper significantly weakened its mechanical strength in a humid environment because of its hygroscopic nature, and traditional nonbiodegradable polymer coated hydrophobic paper caused microplastics after being discarded. This work developed sustainable cellulose nanocrystals (CNCs) based hydrophobic coatings (DPCs) with self-cleaning properties via self-polymerization of dopamine (DA) and subsequent grafting dodecyltrimethoxysilane (DTMS). The as-produced DPC-3 coating had the highest water contact angle (WCA) of 127.1 ± 1.5° with high water dispersion stability among the other samples because introducing DTMS could significantly transform the hydrophilicity of PDA@CNC to hydrophobicity. Compared to pure CNCs, DPC-3 exhibited excellent thermal stability, and its maximum decomposition temperature (Tmax) improved by 32.5 °C. The obtained DPC-3 powder could be well mixed with chemical solutions and applied to the various substrate surfaces to form hydrophobic and self-cleaning coatings for versatile and promising multi-scenario applications in the waterproofing of paper-based express boxes, fabrics, and paper, as well as self-cleaning of glass. Such improved hydrophobic and high-performance DPCs coatings showed promising choices to reduce the use of nonbiodegradable polymer coating.
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