Nanoemulsions with enhanced temperature stability using thermo-sensitive association of nonionic surfactant and amphiphilic polyelectrolytes

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• 作者：Johanna Galindo-Alvarez^a ; Vé ; ronique Sadtler^b ; Philippe Marchal^b ; Patrick Perrin^c ; Christophe Tribet^c ; Emmanuelle Marie^a ; Alain Durand^a ; ^{Alain.Durand@ensic.inpl-nancy.fr}
• 关键词：Nonionic surfactants ; Amphiphilic polymers ; Nanoemulsions ; Temperature sensitivity
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2012
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：20 February, 2012
• 卷：396
• 期：Complete
• 页码：115-121
• 文件大小：767 K

摘要

Aqueous mixtures containing a non-ionic surfactant (tetraethylene glycol monododecylether, C₁₂E₄), an amphiphilic polymer (poly(sodium acrylate) hydrophobically modified with azobenzene groups randomly attached along the chains, HMPA) and 0.3 M NaNO₃ were studied regarding the associations between macromolecules and surfactant assemblies (micelles or lamellar phases) at various temperatures (4-37 掳C). The effects of the thermo-induced transition of surfactant assemblies from micelles to lamellar phase on phase separation behavior were systematically investigated as a function of surfactant and polymer concentration, polymer structure (amount of grafted hydrophobic groups) and temperature. Rheological properties of polymer-rich coacervates revealed thermo-thickening behavior, in accordance with phase separation behavior. Finally, bulk phenomena were applied to design nanoemulsions with improved temperature stability taking the opportunity of strengthening interfacial layers through thermo-thickening properties.