Binary Blends of Diblock Copolymers: An Effective Route to Novel Bicontinuous Phases,Macromolecular Theory and Simulations

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Binary Blends of Diblock Copolymers: An Effective Route to Novel Bicontinuous Phases
Macromolecular Theory and Simulations ( IF 1.8 ) Pub Date : 2021-04-26 , DOI: 10.1002/mats.202100019
Chi To Lai ₁ , An‐Chang Shi ₁

Affiliation

The formation of various bicontinuous phases from binary blends of linear AB diblock copolymers (DBCPs) is studied using the polymeric self-consistent field theory. The theoretical study predicts that the double diamond and the “plumber's nightmare” phases, which are metastable for neat DBCPs, could be stabilized in block copolymers with designed dispersity, namely, binary blends composed of a gyroid-forming DBCP and a homopolymer-like DBCP. The spatial distribution of different monomers reveals that these two types of DBCPs are segregated such that the homopolymer-like component is localized at the nodes to relieve the packing frustration. Simultaneously, the presence of a local segregation of the two DBCPs on the AB interface regulates the interfacial curvature. These two mechanisms could act in tandem for homopolymer-like DBCPs with proper compositions, resulting in larger stable regions for the novel bicontinuous phases.

中文翻译：

二嵌段共聚物的二元共混物：新型双连续相的有效途径

使用聚合物自洽场理论研究了线性AB双嵌段共聚物（DBCP）的二元共混物形成的各种双连续相。理论研究预测，对于纯净DBCP而言，亚金刚石双相和“管道工的噩梦”相对于亚稳态而言是稳定的，它们可以在具有设计分散性的嵌段共聚物中稳定，即由形成类固醇的DBCP和类似均聚物的DBCP组成的二元共混物。。不同单体的空间分布表明，这两种类型的DBCP是分离的，使得类似均聚物的组分位于节点处，以减轻包装的挫败感。同时，AB界面上两个DBCP的局部偏析会调节界面曲率。

更新日期：2021-05-25

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