Propriétés tensioactives et rhéologiques du caprate de tréhalose : influence des interactions en solutions avec l'alginate associatif

Abstract : The present study aims at determining first the surface and rheological properties of a novel sugar ester, the trehalose caprate synthesized by enzymatic catalysis. The interaction with alginate associative polymer solution is then studied. At 20°C, trehalose caprate has a CMC of 50 mM and a viscosity of 1 mPa under 0.8 wt%. For concentrations around 0.8 and 23 wt%, the viscosity increased and stabilized at higher concentrations. This behavior suggests the formation of worm-like micelles and multiconnected tubular network. ln addition to the alginate associative polymer and at 13 g/l, the zero-shear viscosity ofpolymer solution shows a three domain variation: As the trehalose caprate concentration increased, the zero shear viscosity first increased then decreased. At higher trehalose caprate concentrations, the zero-shear viscosity presented a second increase. This variation was attributed to the interaction between the surfactant and the hydrophobic alkyl chains of alginate.
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Dorra Sfayhi. Propriétés tensioactives et rhéologiques du caprate de tréhalose : influence des interactions en solutions avec l'alginate associatif. Sciences agricoles. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL083N⟩. ⟨tel-01749966⟩

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