Benjamin R. Magruder, David C. Morse, Christopher J. Ellison and Kevin D. Dorfman*,
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引用次数: 0
摘要
双甲酰相 AB 二嵌段聚合物薄膜的自洽场理论表明,在薄膜边界没有单体物种优先润湿的情况下,(211) 平面平行于边界的薄膜比其他取向的薄膜更稳定,这与实验结果一致。这种优先取向可以用边界挫折来解释。具体来说,A/B 界面与薄膜边界的交角,即润湿角,在热力学上被限制在一个很小的数值范围内。双陀螺仪中的大多数端面都无法适应这一狭窄的润湿角范围,而不会出现相对于块体形态的显著局部变形;具有 "双波 "图案的 (211) 取向端面产生的变形相对最小,使其成为受挫最小的边界。边界受挫原理提供了一个框架,可用于理解封闭在平坦、非优选边界之间的复杂有序嵌段聚合相终止面的相对稳定性。
Self-consistent field theory for thin films of AB diblock polymers in the double-gyroid phase reveals that in the absence of preferential wetting of monomer species at the film boundaries, films with the (211) plane oriented parallel to the boundaries are more stable than other orientations, consistent with experimental results. This preferred orientation is explained in the context of boundary frustration. Specifically, the angle of intersection between the A/B interface and the film boundary, the wetting angle, is thermodynamically restricted to a narrow range of values. Most termination planes in the double gyroid cannot accommodate this narrow range of wetting angles without significant local distortion relative to the bulk morphology; the (211)-oriented termination plane with the “double-wave” pattern produces relatively minimal distortion, making it the least frustrated boundary. The principle of boundary frustration provides a framework to understand the relative stability of termination planes for complex ordered block polymer phases confined between flat, nonpreferential boundaries.
期刊介绍:
ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science.
With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.