Study of the influences of film processing conditions and glycerol amount on the water sorption and gas barrier properties of novel sodium caseinate films - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Membrane Science Année : 2015

Study of the influences of film processing conditions and glycerol amount on the water sorption and gas barrier properties of novel sodium caseinate films

Résumé

This study deals with water sorption characteristics and gas barrier properties of sodium caseinate based edible films as a function of processing type and processing additives. Two processing routes are adopted: solution casting and blown-film-extrusion. Two processing additives are used: glycerol as plasticizer and ethanol as protein denaturing agent. It is shown at first that the water and gas transport properties are neither affected by the processing technology nor by the use of ethanol during the fabrication step. Water sorption and thermal properties of blown films prepared for glycerol contents varying from 15 to 25 wt% are then studied for a wide range of relative humidity. The determination of the water sorption isotherms and their modeling by Park's equation as well as the study of the water sorption kinetics parameters allow discussing the sorption mechanisms as a function of the respective plasticizing effect of glycerol and water, on one hand and of the ability of water molecules to form clusters within the material, on the other hand. The decrease of the glass transition temperature values of the films as a function of increasing water content is analyzed thanks to Gordon-Taylor equation and it is related to the respective plasticizing role of glycerol and water, as evidenced from water sorption analysis.
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Dates et versions

hal-01151612 , version 1 (13-05-2015)

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Basal Yilin Colak, Fabrice Gouanvé, Pascal Degraeve, Eliane Espuche, Frédéric Prochazka. Study of the influences of film processing conditions and glycerol amount on the water sorption and gas barrier properties of novel sodium caseinate films. Journal of Membrane Science, 2015, 478, pp.1-11. ⟨10.1016/j.memsci.2014.12.027⟩. ⟨hal-01151612⟩
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