期刊
CELLULOSE
卷 26, 期 4, 页码 2389-2401出版社
SPRINGER
DOI: 10.1007/s10570-018-2211-7
关键词
Chitosan; Cellulose nanocrystals; Nanoclays; Biocomposites; Bioinspired materials
Herein, we report a novel approach for the preparation of chitosan films with improved mechanical and barrier properties, by incorporating a mixture of nanoclays (MMT) and cellulose nanocrystals (CNC), via a water-evaporation-induced self-assembly process. The improvements obtained were assigned to: (1) the slow evaporation of water, leading to nacre-like structures; (2) a synergistic effect created between MMT and CNC. The best mechanical properties were obtained with a weight ratio MMT/CNC 1:2, which led to a significant improvement in tensile strength (+230%) and tensile modulus (+448%). In addition, the thermal stability of the films was also improved, while the water vapor and oxygen transmission rates were reduced. The improved barrier properties were attributed to the nacre-like layered structure formed by the sodium cloisite platelets within the chitosan matrix, which slowed down the diffusion of water and oxygen. [GRAPHICS] .
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