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Erschienen in: Cellulose 14/2020

20.07.2020 | Original Research

UV-protecting films based on bacterial cellulose, glycerol and polyvinyl alcohol: effect of water activity on barrier, mechanical and optical properties

verfasst von: Patricia Cazón, Gonzalo Velazquez, Manuel Vázquez

Erschienen in: Cellulose | Ausgabe 14/2020

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Abstract

Biodegradable films based on bacterial cellulose, glycerol and polyvinyl alcohol are a new alternative to develop food packaging with the capacity to retard or inhibit the effect of UV radiation. However, these compounds are sensitive to moisture. Therefore, the purpose of this study was to evaluate the modifications of the mechanical, water vapor permeability and optical properties of these composite films depending on their water activity. Results showed that water molecules acted as a plasticizer agent, modifying the mechanical, water vapor permeability and optical properties of the developed films. However, an overplastification process took place at higher activity water, resulting in a weakness of film structure and decreasing drastically the elongation. The transmittance in the UV–VIS light region decreased when the activity water increased. No significant variations were observed in color, transparency or opacity properties.

Graphic abstract

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Metadaten
Titel
UV-protecting films based on bacterial cellulose, glycerol and polyvinyl alcohol: effect of water activity on barrier, mechanical and optical properties
verfasst von
Patricia Cazón
Gonzalo Velazquez
Manuel Vázquez
Publikationsdatum
20.07.2020
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 14/2020
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-020-03346-9

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