This study successfully prepared superhydrophobic cellulose nanofiber (CNF) composite films (denoted as KH550-SiO2/CNF-M) by adjusting the proportions of methyltrimethoxysilane (MTMS) and silane coupling agent KH550-modified nano-SiO2.The chemical structure,microstructure,and thermal stability of the composite films were characterized using Fourier transform infrared spectroscopy,scanning electron microscopy,and thermogravimetric analysis.Research indicated that adding MTMS at 10wt.% and KH550-SiO2 at 2.5wt.% resulted in films with optimal hydrophobic properties and a surface contact angle of 159°,aligning with superhydrophobic standards and maintaining high mechanical properties.The modified nano-SiO2,ranging from 32-106nm in size,were evenly distributed within the CNF matrix without agglomeration.The superhydrophobicity of KH55-SiO2/CNF-M commpsite films stemmed from the synergistic effects of MTMS and modified nano-SiO2:MTMS effectively formed a low-energy organosilicon layer on the CNF surface.The modified nano-SiO2 improved the film's surface roughness,serving as the primary factor in boosting hydrophobic efficiency.
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