Environmentally Friendly Films Combining Bacterial Cellulose, Chitosan, and Polyvinyl Alcohol: Effect of Water Activity on Barrier, Mechanical, and Optical Properties.,Biomacromolecules

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Environmentally Friendly Films Combining Bacterial Cellulose, Chitosan, and Polyvinyl Alcohol: Effect of Water Activity on Barrier, Mechanical, and Optical Properties.
Biomacromolecules ( IF 5.5 ) Pub Date : 2019-12-17 , DOI: 10.1021/acs.biomac.9b01457
Patricia Cazón _{1,

2} , Manuel Vázquez ₂ , Gonzalo Velazquez ₁

Affiliation

The interest in developing new materials intended for food packaging based on bacterial cellulose is growing in the recent years. Flexible and transparent films from bacterial cellulose-chitosan-polyvinyl alcohol have shown excellent UV-barrier properties. However, this material interacts with ambient moisture modifying its water activity due to its hydrophilic nature. In this work, a study was carried out to evaluate the changes caused by the water activity. Results showed a plasticizing effect of water molecules increasing the water vapor permeability of the samples from 1.86 × 10-12 to 1.17 × 10-11 g/m·s·Pa, percentage of elongation from 3.25 to 36.55%, and distance to burst from 0.64 to 5.12 mm. The increase of the water activity decreased the Young's modulus and tensile strength. The values of the UV-barrier were maintained at the wide range of water activity. Consequently, water molecules do not affect the UV-barrier properties of the films.

中文翻译：

结合细菌纤维素，壳聚糖和聚乙烯醇的环保薄膜：水分活度对阻隔性，机械和光学性能的影响。

近年来，对开发用于基于细菌纤维素的食品包装的新材料的兴趣日益增长。由细菌纤维素-壳聚糖-聚乙烯醇制成的柔性透明薄膜具有出色的紫外线阻隔性能。然而，由于其亲水性，该材料与周围的水分相互作用而改变其水活度。在这项工作中，进行了一项研究，以评估由水分活度引起的变化。结果表明，水分子的增塑作用使样品的水蒸气透过率从1.86×10-12增至1.17×10-11 g / m·s·Pa，伸长率从3.25增加至36.55％，并且从0.64至5.12毫米。水分活度的增加降低了杨氏模量和拉伸强度。紫外线阻隔剂的值保持在广泛的水活度范围内。因此，水分子不会影响薄膜的紫外线阻隔性能。

更新日期：2019-12-18

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