TY - JOUR
T1 - Regenerated cellulose films combined with glycerol and polyvinyl alcohol
T2 - Effect of moisture content on the physical properties
AU - Cazón, Patricia
AU - Velázquez, Gonzalo
AU - Vázquez, Manuel
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/6
Y1 - 2020/6
N2 - Regenerated cellulose-based films combined with glycerol and polyvinyl alcohol (PVOH) show interesting UV-light barrier properties, with potential application in food packaging to prevent oxidative deterioration. However, these materials are sensitive to moisture, and their properties could be modified as a function of the relative humidity. Hence, the objective of the present work was to evaluate the changes in the main properties of regenerated cellulose-glycerol-PVOH films depending on the relative humidity. Using the GAB adsorption isotherms, the moisture content was related with the water activity of the films at several relative humidity conditions. According to the obtained results, water molecules manifested a plasticizing effect modifying the mechanical, water vapour permeability and optical properties of the developed films. Tensile strength and Young's modulus values ranged from 92.65 to 17.57 MPa and from 3639.09 to 227.89 MPa, respectively. Both of them decreased when the moisture content increased. The mechanical resistance to deformation of films enhanced at high moisture content, changing from 5.88 to 15.97% and from 0.59 to 2.97 mm in the tensile and puncture test, respectively. This effect was also observed for the burst strength. Water vapour permeability increased from 5.15·10−10 to 5.44·10−9 g/ms Pa when the moisture content increased, being more significative at higher values. No significant variations were observed in the UV-VIS transmittance at different moisture contents. The obtained results allow expanding the knowledge of the behavior of films based on regenerated cellulose.
AB - Regenerated cellulose-based films combined with glycerol and polyvinyl alcohol (PVOH) show interesting UV-light barrier properties, with potential application in food packaging to prevent oxidative deterioration. However, these materials are sensitive to moisture, and their properties could be modified as a function of the relative humidity. Hence, the objective of the present work was to evaluate the changes in the main properties of regenerated cellulose-glycerol-PVOH films depending on the relative humidity. Using the GAB adsorption isotherms, the moisture content was related with the water activity of the films at several relative humidity conditions. According to the obtained results, water molecules manifested a plasticizing effect modifying the mechanical, water vapour permeability and optical properties of the developed films. Tensile strength and Young's modulus values ranged from 92.65 to 17.57 MPa and from 3639.09 to 227.89 MPa, respectively. Both of them decreased when the moisture content increased. The mechanical resistance to deformation of films enhanced at high moisture content, changing from 5.88 to 15.97% and from 0.59 to 2.97 mm in the tensile and puncture test, respectively. This effect was also observed for the burst strength. Water vapour permeability increased from 5.15·10−10 to 5.44·10−9 g/ms Pa when the moisture content increased, being more significative at higher values. No significant variations were observed in the UV-VIS transmittance at different moisture contents. The obtained results allow expanding the knowledge of the behavior of films based on regenerated cellulose.
KW - Adsorption isotherms
KW - Moisture content
KW - Plasticization
KW - Regenerated cellulose
KW - Water vapour permeability
UR - http://www.scopus.com/inward/record.url?scp=85078057596&partnerID=8YFLogxK
U2 - 10.1016/j.foodhyd.2020.105657
DO - 10.1016/j.foodhyd.2020.105657
M3 - Artículo
AN - SCOPUS:85078057596
SN - 0268-005X
VL - 103
JO - Food Hydrocolloids
JF - Food Hydrocolloids
M1 - 105657
ER -