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Formation of Perpendicular Three-Dimensional Network Nanostructures in ABC-Star Copolymers
Langmuir ( IF 3.9 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.langmuir.2c00140
Mingshuang Qian 1 , Yuci Xu 1
Affiliation  

Perpendicular arrangements in hierarchical nanostructures show superior mechanical properties and provide great opportunities for the development of advanced membranes because different channels are connected by the perpendicular blocks. To obtain these perpendicular hierarchical nanostructures, we use a simple ABC-star terpolymer because of the existence of a conjunction point by using the A block as a polymer network template, which guides the BC phase separation accordingly. When χBC is 10, the formed phase and the corresponding phase diagram of ABC-star are similar to those of the AB2 triblock because of the mixture between the B and C blocks. Interestingly, at increased χBC, the B and C blocks phase separate, leading to the formation of a series of perpendicular nanostructures, including perpendicular lamellae-in-lamellae (L), perpendicular lamellae-in-cylinder (C), and even perpendicular three-dimensional polymer networks (G). The corresponding stability regime of each phase is identified through the dedicated comparison of free energy, which can well explain the missing phases in Monte Carlo simulations. Our proposed design route according to the target structures and the calculated phase diagram can provide useful guidance for the experimental observation of these perpendicular nanostructures.

中文翻译:

ABC-Star 共聚物中垂直三维网络纳米结构的形成

分层纳米结构中的垂直排列显示出优异的机械性能,并为先进膜的开发提供了巨大的机会,因为不同的通道由垂直块连接。为了获得这些垂直的分层纳米结构,我们使用简单的 ABC 星型三元共聚物,因为通过使用 A 嵌段作为聚合物网络模板存在连接点,从而相应地引导 BC 相分离。当χ BC为10 时,ABC-star 的形成相和相应的相图与AB 2三嵌段的相类似,因为B 和C 嵌段之间存在混合。有趣的是,在增加的 χ BC,B和C嵌段相分离,导致形成一系列垂直的纳米结构,包括垂直的层中层(L⊥)、垂直的柱中层(C⊥ 甚至垂直的三维聚合物网络(G )。通过对自由能的专门比较来确定每个相的相应稳定状态,这可以很好地解释蒙特卡罗模拟中缺失的相。我们根据目标结构和计算的相图提出的设计路线可以为这些垂直纳米结构的实验观察提供有用的指导。
更新日期:2022-06-22
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