Synthesis and Solution Properties of Sulfate-Type Hybrid Surfactants with an Ethylene Spacer
Synthesis and Solution Properties of Sulfate-Type Hybrid Surfactants with an Ethylene Spacer
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DOI：
10.5650/jos.54.167
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发表时间：
2005
影响因子：
1.5
通讯作者：
Haruhiko Miyazawa;Y. Kondo;N. Yoshino
中科院分区：
文献类型：
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作者：
Haruhiko Miyazawa;Y. Kondo;N. Yoshino
合成了九种分子中带有乙烯间隔基的硫酸盐型杂化表面活性剂，CmF2m+1C2H4CH(OSO3Na)CnH2n+1 (FmEHnOS: m = 4, 6, 8; n = 3, 5, 7)。 FmEHnOS 的产率高于之前合成的杂化表面活性剂。虽然 FmEHnOS 在弱酸性水溶液中通过强碱性介质很难水解，但这些表面活性剂在强酸性介质中水解，得到醇衍生物 FmEHnA。它们具有高水溶性和高表面活性。通过表面张力测量确定的临界胶束浓度（cmc）比带有苯环间隔基的硫酸盐型杂化表面活性剂 CmF2m+1C6H4CH(OSO3Na)CnH2n+1 (FmPHnOS: C6H4 = 对亚苯基)高约 3.5 倍，并且发现 cmc 遵循克莱文斯规则。新合成的表面活性剂在不同浓度的NMR谱中ω-CF3和ω-CH3基团的化学位移的变化表明F4EH3OS胶束中的碳氟化合物和烃链发生了胶束内相分离。在 10 wt% F8EH3OS 溶液中观察到热响应性表面活性剂凝胶形成。
Nine sulfate-type hybrid surfactants with an ethylene spacer in their molecule, CmF2m+1C2H4CH(OSO3Na)CnH2n+1 (FmEHnOS: m = 4, 6, 8; n = 3, 5, 7), were synthesized. FmEHnOS were obtained in a yield higher than those for the hybrid surfactants previously synthesized. While FmEHnOS were hardly susceptible to hydrolysis in aqueous weakly acidic through strongly alkaline media, these surfactants were hydrolyzed in highly acidic media to give alcohol derivatives, FmEHnA. They were highly water-soluble and highly surface-active. Their critical micelle concentrations (cmc) determined by surface tension measurements were about 3.5 times higher than those of sulfate-type hybrid surfactants with a benzene ring spacer, CmF2m+1C6H4CH(OSO3Na)CnH2n+1 (FmPHnOS: C6H4 = p-phenylene), and the cmcs were found to obey the Klevens’ rule. Changes in the chemical shifts of ω-CF3 and ω-CH3 groups in the NMR spectra of the newly synthesized surfactants at different concentrations suggested that the fluorocarbon and hydrocarbon chains in F4EH3OS micelles undergo an intramicellar phase separation. Thermoresponsive surfactant gel formation was observed for 10 wt% F8EH3OS solution.