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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >The Effect of Ionic Liquid Hydrophobicity and Solvent Miscibility on Pluronic Amphiphile Self-Assembly
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The Effect of Ionic Liquid Hydrophobicity and Solvent Miscibility on Pluronic Amphiphile Self-Assembly

机译：离子液体的疏水性和溶剂混溶性对Pluronic两亲物自组装的影响

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摘要

The phase behavior of the triblock copolymer, (EO)_(20)(PO)_(70)(EO)_(20) (P123), in the water-immiscible (hydrophobic) ionic liquids (ILs), 1-butyl-3-methylimidazoIium hexafluorophosphate (bmimPFg), and tris(pentafluoroethyl)trifluorophospriate (bmimFAP), has been investigated, and its amphophilic self-assembly examined using small-angle X-ray scattering. The results obtained are contrasted with those for P123 in water. Direct and water-swellable micellar, hexagonal, and lamellar phases of P123 are found in bmimPF6, which behaves like a polar solvent despite being water immiscible, but bmimFAP behaves as a truly hydrophobic solvent, forming only a lamellar phase over a narrow composition range. The miscibility of bmimPF6 and water is increased by P123 addition, and at sufficiently high P123 concentrations, a single lamellar phase forms in which bmimPF6 and water are miscible in all proportions. In contrast, the preferential solubilization of bmimPF6 by PEO chains and bmimFAP by PPO chains causes the nanosegregation of these miscible ILs in concentrated P123 solutions. This leads to the formation of a P123/bmimPF6/bmimFAP microemulsion where bmimPF6 is the polar solvent and bmimFAP is the non-polar solvent.
机译：三嵌段共聚物（EO）_（20）（PO）_（70）（EO）_（20）（P123）在与水不混溶的（疏水）离子液体（ILs）中的相行为已经研究了-3-甲基六氟磷酸咪唑鎓（bmimPFg）和三（五氟乙基）三氟磷酸酯（bmimFAP），并使用小角度X射线散射研究了其两亲性自组装。将所得结果与水中P123的结果进行对比。在bmimPF6中发现了P123的直接相和水可溶胀的胶束状，六方相和层状相，尽管与水不混溶，其行为仍类似于极性溶剂，但bmimFAP的作用却是真正的疏水性溶剂，仅在较窄的组成范围内形成层状相。通过添加P123可以提高bmimPF6与水的混溶性，并且在足够高的P123浓度下，会形成单层相，其中bmimPF6与水可以所有比例混溶。相反，PEO链对bmimPF6的优先溶解和PPO链对bmimFAP的优先溶解导致这些可混溶IL在浓缩的P123溶液中发生纳米分离。这导致形成P123 / bmimPF6 / bmimFAP微乳液，其中bmimPF6是极性溶剂，bmimFAP是非极性溶剂。

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