A nanostructural investigation of the effect of glycerol on the molecular packing, thermodynamic state and water sorption behaviour of glassy gelatin films

P. Díaz-Calderón, M. Roussenova, J. Enrione, M. A. Alam

Resultado de la investigación: Contribución a una revistaArtículo de la conferenciarevisión exhaustiva

Resumen

This work explores the effect of glycerol, a low molecular weight polyol, on the molecular packing, thermodynamic state and water sorption of low water content gelatin films. For this purpose, bovine gelatin films with different glycerol contents (0-10% wt.) were equilibrated at a range of relative humidities (RH=11-44%, T=298K). Our PALS measurements show that over the concentration range studied, glycerol acts as a packing enhancer (causing a non-linear decrease in the average molecular hole size), whilst reducing the glass transition temperature of the gelatin films. Glycerol also alters the water sorption behaviour of the glassy gelatin films, (whereby reducing the amount of water absorbed at well defined relative humidities), highlighting the importance of molecular packing for the sorption of water vapour in the glassy state.

Idioma originalInglés
Número de artículo012056
PublicaciónJournal of Physics: Conference Series
Volumen443
N.º1
DOI
EstadoPublicada - 2013
Evento16th International Conference on Positron Annihilation, ICPA 2012 - Bristol, Reino Unido
Duración: 19 ago 201224 ago 2012

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