4.7 Article

Preparation and characterization of bionanocomposite films based on wheat starch and reinforced with cellulose nanocrystals

期刊

CELLULOSE
卷 28, 期 12, 页码 7781-7793

出版社

SPRINGER
DOI: 10.1007/s10570-021-04017-z

关键词

Thermoplastic starch; Solvent casting; Bionanocomposite films; Wheat starch; Cellulose nanocrystals

资金

  1. Xunta de Galicia Government [ED431C 2019/17]
  2. Universidade da Coruna/CISUG

向作者/读者索取更多资源

The study prepared environmentally friendly films by using cellulose nanocrystals to reinforce bionanocomposites, showing improved moisture resistance and barrier properties while maintaining thermal stability, making them suitable for short-term applications such as food packaging.
In recent times, the attention of scientific community has been focusing on the replacement of petroleum-based polymers by others more environmentally friendly. In this sense, bionanocomposites based on glycerol-plasticized wheat starch and reinforced with cellulose nanocrystals (CNCs) were prepared by a solvent-casting process to obtain environmentally friendly films. The plasticization process was proven to be complete in the conditions used and no residual crystallinity was observed in any case. The incorporation of CNCs leads to materials with increased rigidity (about 1000% increment in modulus) which is related to a good filler-matrix interaction and to the formation of a rigid crystalline network of cellulose. This fact allowed also to improve the moisture resistance and the barrier properties (in both, oxygen and water vapor as permeant) of the bionanocomposite films due to the formation of a tortuous path, which prevent the gas diffusion. Moreover, the thermal stability of films was not affected by the filler incorporation. These improvements in the properties make these films susceptible to be used in short-time applications in the food packaging industry.

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