Functional Nanocavity Arrays via Amphiphilic Block Copolymer Thin Films
Functional Nanocavity Arrays via Amphiphilic Block Copolymer Thin Films
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DOI：
10.1021/ma7019418
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发表时间：
2008-02
期刊：
影响因子：
5.5
通讯作者：
A. C. Miller;R. Bennett;P. Hammond;D. Irvine;R. Cohen
中科院分区：
文献类型：
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作者：
A. C. Miller;R. Bennett;P. Hammond;D. Irvine;R. Cohen
两亲性嵌段共聚物聚苯乙烯-嵌段-聚丙烯酸 (PS-b-PAA) 在甲苯中形成胶束，可以将其浇注到平面基材上，在 PS 基质中形成球形 PAA 域的准六边形阵列。用适当的选择性溶剂处理这些超薄膜会使 PAA 域膨胀，并使 PS 基质破裂（空化），从而将 PAA 链暴露于溶液中。在这里，我们研究了发生这种空化过程所需的条件，以及用一系列短烷基链醇或不同 pH 和离子强度的水溶液处理后 PS-b-PAA 胶束密堆积膜的最终状态聚合物形态。采用原子力显微镜（AFM）和透射电子显微镜（TEM）来表征前体和溶剂处理薄膜的形貌。除了溶剂条件的影响外，我们还发现空化过程还受到 PS 嵌段分子量的影响，并且是热可逆的...
The amphiphilic block copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) forms micelles in toluene that can be cast onto a planar substrate to create quasi-hexagonal arrays of spherical PAA domains in a PS matrix. Treatment of these ultrathin films with an appropriate selective solvent swells the PAA domains and fractures open (cavitates) the PS matrix, thereby exposing the PAA chains to solution. Here we have investigated the conditions required for this cavitation process to occur and the end-state polymer morphology of close-packed films of PS-b-PAA micelles following treatment with a series of short alkyl chain alcohols or aqueous solutions of varying pH and ionic strength. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) were employed to characterize the morphologies of the precursor and solvent-treated films. In addition to the effects of solvent conditions, we show that the cavitation process is influenced by the molecular weight of the PS block and is thermally rever...