UV-protecting films based on bacterial cellulose, glycerol and polyvinyl alcohol

effect of water activity on barrier, mechanical and optical properties

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

Abstract

Biodegradable films based on bacterial cellulose, glycerol and polyvinyl alcohol are a new alternative to develop food packaging with the capac- ity 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 perme- ability 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, trans- parency or opacity properties.

Keywords

GAB model;moisture adsorption isotherms;plasticization;bacterial cellulose;mechanical properties;UV-barrier properties;

Data

Language:	English
Year of publishing:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UNG - University of Nova Gorica
UDC:	54
COBISS:	41876483
ISSN:	0969-0239
Views:	1771
Downloads:	87
Average score:	0 (0 votes)
Metadata:

Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	str. 8199-8213
Volume:	ǂVol. ǂ27
Issue:	ǂiss. ǂ14
Chronology:	2020
DOI:	10.1007/s10570-020-03346-9
ID:	12238548