TY - JOUR
T1 - Environmentally Friendly Films Combining Bacterial Cellulose, Chitosan, and Polyvinyl Alcohol
T2 - Effect of Water Activity on Barrier, Mechanical, and Optical Properties
AU - Cazón, Patricia
AU - Vázquez, Manuel
AU - Velazquez, Gonzalo
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2020/2/10
Y1 - 2020/2/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85077064576&partnerID=8YFLogxK
U2 - 10.1021/acs.biomac.9b01457
DO - 10.1021/acs.biomac.9b01457
M3 - Artículo
C2 - 31804071
AN - SCOPUS:85077064576
SN - 1525-7797
VL - 21
SP - 753
EP - 760
JO - Biomacromolecules
JF - Biomacromolecules
IS - 2
ER -