TY - JOUR
T1 - Regenerated cellulose films with chitosan and polyvinyl alcohol
T2 - Effect of the moisture content on the barrier, mechanical and optical properties
AU - Cazón, Patricia
AU - Vázquez, Manuel
AU - Velázquez, Gonzalo
N1 - Publisher Copyright:
© 2020
PY - 2020/5/15
Y1 - 2020/5/15
N2 - The aim of this research was to evaluate the effect of moisture content on the mechanical, barrier and optical properties of films obtained from regenerated cellulose with chitosan and polyvinyl alcohol equilibrated at several relative humidity conditions. The experimental moisture adsorption isotherms were fitted using the Guggenheim-Anderson-DeBoer model. The adsorption isotherm showed a typical type II sigmoidal shape. The highest moisture content (27.53 %) was obtained at a water activity of 0.9. The water vapour permeability values increased up to 6.34·10−11 g/ m s Pa as the moisture content of the films increased. Tensile strength, percentage of elongation, Young's modulus, burst strength and distance to burst showed a significant plasticizing effect of the water molecules. Results suggest that interactions between film components and water molecules decrease the transmittance in the UV region and the transparency. Consequently, water molecules improve the UV-barrier properties of the films and increasing the opacity.
AB - The aim of this research was to evaluate the effect of moisture content on the mechanical, barrier and optical properties of films obtained from regenerated cellulose with chitosan and polyvinyl alcohol equilibrated at several relative humidity conditions. The experimental moisture adsorption isotherms were fitted using the Guggenheim-Anderson-DeBoer model. The adsorption isotherm showed a typical type II sigmoidal shape. The highest moisture content (27.53 %) was obtained at a water activity of 0.9. The water vapour permeability values increased up to 6.34·10−11 g/ m s Pa as the moisture content of the films increased. Tensile strength, percentage of elongation, Young's modulus, burst strength and distance to burst showed a significant plasticizing effect of the water molecules. Results suggest that interactions between film components and water molecules decrease the transmittance in the UV region and the transparency. Consequently, water molecules improve the UV-barrier properties of the films and increasing the opacity.
KW - Adsorption isotherms
KW - Chitosan
KW - Moisture content
KW - Plasticization
KW - Polyvinyl alcohol
KW - Regenerated cellulose
KW - Water vapour permeability
UR - http://www.scopus.com/inward/record.url?scp=85079846462&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2020.116031
DO - 10.1016/j.carbpol.2020.116031
M3 - Artículo
C2 - 32172847
AN - SCOPUS:85079846462
SN - 0144-8617
VL - 236
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
M1 - 116031
ER -