INVESTIGADORES
SLAVUTSKY Anibal Marcelo
artículos
Título:
Thermodynamic study of water sorption and water barrier properties of nanocomposite films based on brea gum
Autor/es:
SLAVUTSKY, ANIBAL M.; BERTUZZI, MARÍA A.
Revista:
APPLIED CLAY SCIENCE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2015
ISSN:
0169-1317
Resumen:
Water transport in edible films based on hydrophilic polymers is a complex phenomenon due to the strong interactions
of sorbed watermolecules with the polymeric structure. The effect ofmontmorillonite (Mt) nanoparticle
incorporation into brea gum (BG) based films was studied through thermodynamic and phenomenological
analyses.Moisture adsorption isotherms at three different temperatures of BG based films and BG/Mt nanocomposite
films were obtained. Thermodynamic parameters showed an exothermic process that results less
favourable when Mt is incorporated into the BG matrix, reducing the water uptake. Entropy change and net
isosteric heat of adsorption showed a peak at monolayer water content, which is greater in composite films, indicating
amore stable and ordered structure when Mt was added. Gibb´s energy was indicative of process spontaneity
and of the lower affinity to water composite films.Water vapour permeability depends on the tortuosity
of the pathway formed by Mt nanoparticles and solubility of watermolecules into the BG film matrix.Mt incorporation
reduces the hydrophilic character of BG based films and thus their water vapour permeability.