Department of Chemical Engineering, Polymer Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea.
Langmuir. 2010 Nov 16;26(22):17749-55. doi: 10.1021/la103260g. Epub 2010 Sep 29.
Hydrogen-bonding-directed layer-by-layer assembled films, based on polystyrene-block-poly(acrylic acid) (PS-b-PAA) block copolymer micelles and poly(4-vinylpyridine) (P4VP), were successfully fabricated in methanol. Varying the PAA content in the PS-b-PAA micelles afforded control over the film growth properties, especially the multilayer film thickness. Interestingly, antireflection films with refractive indices that could be tuned between 1.58 and 1.28 were obtained by treatment with an aqueous HCl solution (pH 2.27), and the transmittance obtained was as high as 98.4%. In acid solution, the pyridine group was protonated, destroying the hydrogen bonding between P4VP and PAA. A concomitant pH-induced polymer reorganization in the multilayers resulted in a porous honeycomb-like texture on the substrate.
基于聚苯乙烯-嵌段-聚（丙烯酸）（PS-b-PAA）嵌段共聚物胶束和聚（4-乙烯基吡啶）（P4VP）的氢键导向层层组装膜，在甲醇中成功制备。通过改变 PS-b-PAA 胶束中的 PAA 含量，可以控制膜的生长特性，特别是多层膜的厚度。有趣的是，用 pH 值为 2.27 的盐酸水溶液处理后，得到折射率可在 1.58 和 1.28 之间调节的抗反射膜，透光率高达 98.4%。在酸性溶液中，吡啶基团质子化，破坏了 P4VP 和 PAA 之间的氢键。伴随的 pH 值诱导的多层聚合物重排导致在基底上形成多孔蜂窝状纹理。
