Boundary Frustration in Double-Gyroid Thin Films
Boundary Frustration in Double-Gyroid Thin Films
复制标题
双螺旋薄膜中的边界挫败
DOI：
10.1021/acsmacrolett.4c00026
复制
发表时间：
2024
影响因子：
7.015
通讯作者：
Dorfman, Kevin D.
中科院分区：
文献类型：
--
作者：
Magruder, Benjamin R.;Morse, David C.;Ellison, Christopher J.;Dorfman, Kevin D.
双旋相AB双嵌段聚合物薄膜的自洽场理论表明，在膜边界不存在单体物质优先润湿的情况下，平行于（211）面取向的膜比其他取向的膜更稳定，与实验结果一致。这种偏好取向是在边界挫折的背景下解释的。具体来说，A/B界面与膜边界之间的交点角，即润湿角，在热力学上被限制在一个狭窄的范围内。双陀螺中的大多数终端面无法适应这种狭窄的润湿角范围，而不会相对于体形态产生明显的局部畸变；具有“双波”图案的（211）定向终端面产生相对最小的畸变，使其成为最不受干扰的边界。边界受挫原理提供了一个框架来理解限制在平坦、非优先边界之间的复杂有序嵌段聚合物相的终止面相对稳定性。
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.