{"record":{"leader":"cx  r22     2  45","datafield":[{"ind2":" ","ind1":" ","subfield":{"code":"a","content":"20190406afrey50      ba0"},"tag":100},{"ind2":" ","ind1":" ","subfield":[{"code":"a","content":"fre"},{"code":2,"content":"639-2"}],"tag":101},{"ind2":" ","ind1":" ","subfield":{"code":"a","content":2018},"tag":103},{"ind2":" ","ind1":" ","subfield":[{"code":"a","content":"k"},{"code":"f","content":"fre"}],"tag":104},{"ind2":" ","ind1":" ","subfield":[{"code":"a","content":0},{"code":"b","content":"#"},{"code":"c","content":"#"}],"tag":106},{"ind2":" ","ind1":" ","subfield":{"code":"a","content":"AFNOR"},"tag":152},{"ind2":" ","ind1":" ","subfield":{"code":"a","content":"Oeuvre Textuelle"},"tag":189},{"ind2":" ","ind1":" ","subfield":[{"code":7,"content":"ba0yba0"},{"code":"t","content":"Synthèse et caractérisation de dérivés amphiphiles du xanthane, application à la stabilisation d'émulsions"}],"tag":241},{"ind2":" ","ind1":" ","subfield":[{"code":7,"content":"ba0yba0y"},{"code":"a","content":"Les polysaccharides amphiphiles sont constitués d\u2019un squelette hydrophile sur lequel sont greffés des groupements hydrophobes. Ils possèdent des propriétés rhéologiques accrues dues à leur capacité d\u2019auto-organisation en solution aqueuse mais également interfaciales dues à leurs propriétés d\u2019adsorption aux interfaces eau/huile. Néanmoins, peu d\u2019études s\u2019intéressent à conférer ce type de propriétés à des polysaccharides complexes en termes de structure ou de conformation, comme le xanthane. En effet, ce polymère adopte en solution deux conformations distinctes selon les conditions expérimentales : une forme ordonnée hélicoïdale rigide et une forme désordonnée de type pelote flexible.Partant de ce constat, l\u2019objectif de ce travail de thèse est de déterminer l\u2019impact de la rigidité du squelette du xanthane modifié hydrophobiquement sur les propriétés amphiphiles en solution mais également sur les propriétés stabilisantes en émulsion.Il s\u2019avère que la conformation adoptée par le polymère pendant le processus de greffage a un impact majeur sur ses propriétés rhéologiques : le xanthane modifié sous forme désordonnée possède un caractère associatif, contrairement au xanthane modifié sous forme ordonnée.De plus, le xanthane modifié hydrophobiquement est capable, sous certaines conditions, de former et de stabiliser des émulsions H/E, sans ajout de tensioactif moléculaire, en se partitionnant entre stabilisation de l\u2019interface eau/huile et maintien de la viscosité de la phase aqueuse continue."}],"tag":300},{"ind2":" ","ind1":" ","subfield":[{"code":7,"content":"ba0yba0y"},{"code":"a","content":"Amphiphilic polysaccharides are composed of a hydrophilic backbone grafted with hydrophobic moieties. They show specific rheological properties due to their capacity to self-associate in solution, but also interfacial properties due to their ability to adsorb at the water/oil interface. However, only few studies describe the chemical modification of complex heteropolysaccharides regarding their structure or their conformation, such as xanthan. Indeed, this polysaccharide can adopt in solution two distinct conformations depending on experimental conditions: an ordered rigid helix or a disordered flexible coil.The objective of this work is to determine the impact of the chain stiffness of hydrophobically modified xanthan on associative properties in solution, but also on stabilizing properties in emulsion.The conformation adopted by the polymer during the grafting procedure has a major impact on the rheological properties: xanthan modified under disordered conformation is an associative polysaccharide, contrary to xanthan modified under its ordered conformation.In addition, hydrophobically modified xanthan is able, under certain conditions, to form and stabilize O/W emulsion, without further addition of molecular surfactant, by partitioning between stabilization of the water/oil interface and viscosifying the continuous aqueous phase."}],"tag":300},{"ind2":0,"ind1":" ","subfield":[{"code":"b","content":"Thèse de 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