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

effect of water activity on barrier, mechanical and optical properties

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

Povzetek

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.

Ključne besede

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

Podatki

Jezik:	Angleški jezik
Leto izida:	2020
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UNG - Univerza v Novi Gorici
UDK:	54
COBISS:	41876483
ISSN:	0969-0239
Št. ogledov:	1771
Št. prenosov:	87
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

URN:	URN:SI:UNG
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 8199-8213
Letnik:	ǂVol. ǂ27
Zvezek:	ǂiss. ǂ14
Čas izdaje:	2020
DOI:	10.1007/s10570-020-03346-9
ID:	12238548