Hydrophobic modification of dextran with 1,2-epoxyalkanes in aqueous micellar medium: Competition between interfacial and bulk reactions and consequences on polymer properties

Abstract : Hydrophobic modification of dextran (degree of polymerization around 125) by reaction with 1,2-epoxydodecane was investigated in micellar aqueous medium in which epoxide was dispersed under magnetic stirring in the presence of a cationic surfactant. A base catalyst, sodium hydroxide, was added in water. Dextran derivatives with degrees of substitution up to 10% were prepared. Apart from dextran modification, epoxide molecules underwent interfacial oligomerization which led to by-products that had to be extracted by dialysis followed by Soxhlet extraction. Two main reaction parameters influenced the amount of oligomeric by-products, i.e. temperature and surfactant structure. Adsorption of these compounds at air/water interface was studied by surface tension and dilational rheology measurements and compared to that observed with amphiphilic dextrans prepared in homogeneous conditions.
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Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2013, 436, pp.744-750. 〈10.1016/j.colsurfa.2013.07.045〉
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Soumis le : mercredi 29 mars 2017 - 16:52:38
Dernière modification le : mercredi 12 décembre 2018 - 15:26:25

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Rudy Covis, Catherine Ladavière, Jacques Desbrières, Emmanuelle Marie, Alain Durand. Hydrophobic modification of dextran with 1,2-epoxyalkanes in aqueous micellar medium: Competition between interfacial and bulk reactions and consequences on polymer properties. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2013, 436, pp.744-750. 〈10.1016/j.colsurfa.2013.07.045〉. 〈hal-01498210〉

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