Intelligent Hybrids Research Center, School of Chemical and Biological Engineering, The WCU Program of Chemical Convergence for Energy & Environment, Seoul National University, Seoul 151-744, Republic of Korea.
J Colloid Interface Sci. 2011 Dec 1;364(1):112-7. doi: 10.1016/j.jcis.2011.08.012. Epub 2011 Aug 22.
We introduce a novel and versatile approach for preparing hollow multilayer capsules containing functional hydrophobic components. Protonated polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and anionic polystyrene-block-poly(acrylic acid) (PS-b-PAA) block copolymer micelles (BCM) were used as building blocks for the layer-by-layer assembly of BCM multilayer films onto polystyrene (PS) colloids. After removing the PS colloids, the stabilities of the formed BCM hollow capsules were found to be strongly dependent on the charge density of the hydrophilic corona segments (i.e., P4VP and PAA block segments) as well as the relative molecular weight ratio of hydrophobic core (i.e., PS segments) blocks and hydrophilic corona shells. Furthermore, in the case of incorporating hydrophobic fluorescent dyes into the PS core blocks of micelles, the hairy/hairy BCM multilayers showed well-defined fluorescent images after colloidal template removal process. These phenomena are mainly caused by the relatively high degree of electrostatic interdigitation between the protonated and anionic corona block shells.
我们介绍了一种新颖且多功能的方法，用于制备含有功能性疏水成分的空心多层胶囊。质子化聚苯乙烯嵌段聚（4-乙烯基吡啶）（PS-b-P4VP）和阴离子聚苯乙烯嵌段聚（丙烯酸）（PS-b-PAA）嵌段共聚物胶束（BCM）被用作 BCM 多层膜在聚苯乙烯（PS）胶体上逐层组装的构建块。去除 PS 胶体后，形成的 BCM 空心胶囊的稳定性强烈依赖于亲水性冠层段（即 P4VP 和 PAA 嵌段段）的电荷密度以及疏水性核（即 PS 段）块和亲水性冠壳的相对分子量比。此外，在将疏水性荧光染料掺入胶束的 PS 核块的情况下，在胶体模板去除过程后，毛茸茸/毛茸茸的 BCM 多层膜显示出清晰的荧光图像。这些现象主要是由于质子化和阴离子冠壳之间存在较高程度的静电互穿插。
