Self-assembly of block copolymer micelles in an ionic liquid
Self-assembly of block copolymer micelles in an ionic liquid
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DOI：
10.1021/ja058091t
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发表时间：
2006-03-01
影响因子：
15
通讯作者：
Lodge, TP
中科院分区：
文献类型：
--
作者：
He, YY;Li, ZB;Lodge, TP
四种两亲性聚（（1，2-丁二烯）-嵌段-环氧乙烷）（PB-PEO）二嵌段共聚物在离子液体1-丁基-3-甲基咪唑六氟磷酸盐（[BM 1 M][PF 6]）中强烈聚集并形成胶束。通用胶束结构（球形胶束，蠕虫状胶束，双层囊泡）都访问通过改变电晕块的长度，同时保持核心块恒定。通过低温透射电子显微镜（cryo-TEM）直接观察在离子液体中形成的PB-PEO胶束的纳米结构。从低温TEM和动态光散射测量中提取了详细的胶束结构信息，两种技术之间具有良好的一致性。与相同共聚物的水溶液相比，[BMIM][PF 6]溶液表现出一些独特的特征，例如在25至100 ℃之间的温度不依赖性胶束形态。在水溶液中，也观察到显着的非遍历性效应。这一工作展示了两亲性嵌段共聚物在离子液体中控制纳米结构的灵活性，在许多领域具有潜在的应用。
Four amphiphilic poly ((1,2-butadiene)-block-ethyleneoxide) (PB-PEO) diblock copolymers were shown to aggregate strongly and form micelles in an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMlM][PF6]). The universal micellar structures (spherical micelle, wormlike micelle, and bilayered vesicle) were all accessed by varying the length of the Corona block while holding the core block constant. The nanostructures of the PB-PEO micelles formed in an ionic liquid were directly visualized by cryogenic transmission electron microscopy (cryo-TEM). Detailed micelle structural information was extracted from both cryo-TEM and dynamic light scattering measurements, with excellent agreement between the two techniques. Compared to aqueous solutions of the same copolymers, [BMIM][PF6] solutions exhibit some distinct features, such as temperature-independent micellar morphologies between 25 and 100 degrees C. As in aqueous solutions, significant nonergodicity effects were also observed. This work demonstrates the flexibility of amphiphilic block copolymers for controlling nanostructure in an ionic liquid, with potential applications in many arenas.