Contribution à la mise au point de nouveaux matériaux membranaires pour la filtration de milieux complexes : étude physico-chimique de membranes d'acétate de cellulose et de méthylcellulose partiellement alkylée obtenues par immersion-précipitation

Abstract : In response to today's consumer seeking for high quality oil with an authentic stamp, membrane processing are part of the "mild technologies" looked for, both economically and quality wise. In the present study hydrophobicity is considered as the key for the separation. In the present work, a fractionation device having four compartments allowed the separation of an oil-in-water model emulsion through two commercial membranes of different hydrophobicity. A theoretical model of a hydrophilic/hydrophobic junction was proposed which allows the one way flow of molecules compatible with the barrier surface. In order to create an hydrophobicity scale between the two commercial membranes, new membrane materials must be synthesized. A third membrane was then synthesized from the ternary system of cellulose acetate/acetone/water by the immersion precipitation process. Small angle light scattering measurements defined a nucleation and growth mechanism ruling the phase separation. Further modification of the membranes was conducted by the incorporation of hydrophobically modified methylcellulose through its bond with epoxydodecane aliphatic chains. Membrane surface analysis by ATR-FTIR revealed an absorbance amplification in the alkyl stretching region. XPS high resolution spectra confirmed these observations by the increase of the carbon percentage in alkyl function C-(C,H). Membranes need further hydrophobic modifications in order to obtain better filtration results
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Reine Barbar. Contribution à la mise au point de nouveaux matériaux membranaires pour la filtration de milieux complexes : étude physico-chimique de membranes d'acétate de cellulose et de méthylcellulose partiellement alkylée obtenues par immersion-précipitation. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL009N⟩. ⟨tel-01752496⟩

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