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

doi:10.1088/1742-6596/443/1/012056

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

Research output: Contribution to conference › Paper

Abstract

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.

Original language	American English
DOIs	https://doi.org/10.1088/1742-6596/443/1/012056
State	Published - 1 Jan 2013
Event	Journal of Physics: Conference Series - Duration: 1 Jan 2013 → …

Conference

Conference	Journal of Physics: Conference Series
Period	1/01/13 → …

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10.1088/1742-6596/443/1/012056

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abstract = "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.",

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