Regenerated cellulose films with chitosan and polyvinyl alcohol

effect of the moisture content on the barrier, mechanical and optical properties

Patricia Cazón (Author), Manuel Vázquez (Author), Gonzalo Velazquez (Author)

Abstract

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.

Keywords

adsorption isotherms;plasticization;regenerated cellulose;chitosan;polyvinyl alcohol;water vapour permeability;

Data

Language:	English
Year of publishing:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UNG - University of Nova Gorica
UDC:	54
COBISS:	41884163
ISSN:	0144-8617
Views:	1918
Downloads:	0
Average score:	0 (0 votes)
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