STABILISATION D'EMULSIONS DE SILICONE FONCTIONNALISEE PAR DES CYCLODEXTRINES
Résumé
Emulsions of the oil-in water type were prepared by the method of "spontaneous emulsification". The oil
phase is composed of polymethylhydrosiloxane (PMHS) grafted with cyclodextrins at varying degree of substitution
relative to hydrosilane groups: 20% (PMHSCD20), 30% (PMHSCD30) and 40% (PMHSCD40). The cyclodextrin was
incorporated for its power to solubilize sparingly soluble compounds in water. The stability of emulsions was monitored
by measuring the size distribution of particles in suspension over time. The addition of nonionic surfactants has
significantly improved the stability of the preparations. A comparative study of the stability over time has been
developed for different preparations depending on the nature of the oil PMHSCDx (x = 20, 30 or 40) and various
nonionic surfactants. The best system, in terms of stability, is obtained with PMHSCD20 and the surfactant
Pluronic® F127, which remained stable for four months at room temperature.