Natural cellulose is a kind of environmentally friendly materials widely used in pharmaceutical and plastic processing industry for its excellent biodegradability and mechanical performance. The aim of this paper was to prepare hybrid nanocellulose film with cellulose nanocrystals (CNC) and cellulose nanofibers (CNF) and evaluate the morphological structure, mechanical performance, thermal stability, and light transmittance of the film obtained by vacuum suction filtration method. Acid hydrolysis and high pressure homogenization methods were used to produce CNC and CNF with the help of different acid, alkali, and salt solution. The results revealed that the content of CNF was closely related to the tensile property while the CNC was beneficial to the light transmittance. A rough surface and bumps could be observed in nanocellulose film containing CNC or CNF only. A combination of rod like CNC and filamentous CNF could bring about a balance between mechanical performance, thermal stability, and light transmittance. The results obtained in this paper can offer significant reference to the formula design and optimization of processing parameters in manufacturing of nanocellulose film for packaging in mass production with excellent comprehensive performance.
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We thank the financial support from national natural science foundation of China under grant 51973056, scientific research projects of Hunan provincial department of education under grant 18A258 and 18C0524, natural science foundation of Hunan province under grant 2020JJ6074, and Hunan provincial scientific research and innovation project under grant CX20190843 and CX20190844.
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Hu, C., Zhou, Y., Zhang, T. et al. Morphological, Thermal, Mechanical, and Optical Properties of Hybrid Nanocellulose Film Containing Cellulose Nanofiber and Cellulose Nanocrystals. Fibers Polym 22, 2187–2193 (2021). https://doi.org/10.1007/s12221-021-0903-3