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Synthèse et caractérisation de dérivés amphiphiles du xanthane

Abstract : Hydrophobically modified polysaccharides show unusual rheological and interfacial properties in solution due to the self association of hydrophobic entities grafted onto their hydrophilic backbone. Their properties are tunable according to some well known parameters, such as the length of the hydrophobic moieties or the grafting density. However, very few studies deal with the influence of the backbone conformation on the properties of such systems in solution. Therefore, the objective of this work is to determine the impact of the backbone rigidity on the behavior of an amphiphilic polysaccharide based on xanthan. Indeed, in solution, this polymer can adopt two different conformations depending on the experimental conditions: an ordered, rigid helix or a disordered, flexible coil. Hydrophobic moieties have been grafted on xanthan either under its ordered and disordered conformation. Chains modified under the ordered conformation remain ordered and rigid after grafting and the overall properties are controlled by the high rigidity of the polymer backbone. On the contrary, macromolecules grafted under the disordered form show a more flexible conformation in solution. As a result, the organization of these derivatives is mainly controlled by the attractive interactions between the grafted moieties
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Audrey Roy. Synthèse et caractérisation de dérivés amphiphiles du xanthane. Autre. Université du Havre, 2015. Français. ⟨NNT : 2015LEHA0028⟩. ⟨tel-01666127⟩

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