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Expanding Alternating Spherical and Cylindrical Regions by Tailoring Binary Symmetric ABC/ABC Blends
Macromolecules ( IF 5.1 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.macromol.1c01559 Qingyun Li 1 , Weihua Li 1
Macromolecules ( IF 5.1 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.macromol.1c01559 Qingyun Li 1 , Weihua Li 1
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The self-assembly of a binary blend composed of two different symmetric ABC triblock copolymers has been investigated using self-consistent field theory in the grand canonical ensemble, aiming to expand the phase regions of alternating spherical and cylindrical phases by tailoring the molecular parameters. Our study confirms that the region of the spherical phase is expanded by the effect of bidispersity in which the long and short A-blocks (or C-blocks) form a core–shell distribution within the spherical domain to increase the spontaneous curvature. The bidispersity effect also expands the phase region of the alternating cylinders. In contrast to the spherical phase, the cylindrical region can be expanded by another effect of bidisperse B-blocks to release the high packing frustration of the low-coordinated tetragonal array of alternating A/C cylinders. With optimized parameters, the regions of both the spherical and cylindrical phases are tremendously expanded to such large volume fractions that the spheres and cylinders are remarkably deformed. Our work not only deepens the understanding on the self-assembly mechanism of ABC/ABC blends but also provides a valuable guide for the fabrication of alternating spherical and cylindrical morphologies with large volume fractions.
中文翻译：
通过调整二元对称 ABC/ABC 混合来扩展交替的球面和圆柱区域
在正则系综中使用自洽场论研究了由两种不同对称 ABC 三嵌段共聚物组成的二元共混物的自组装，旨在通过调整分子参数来扩展交替的球相和圆柱相的相区。我们的研究证实，球形相的区域受到双分散性的影响，其中长短 A 嵌段（或 C 嵌段）在球形域内形成核壳分布，以增加自发曲率。双色散效应也扩大了交替圆柱体的相位区域。与球形相相比，圆柱区域可以通过双分散 B 块的另一种效果扩展，以释放交替 A/C 圆柱体的低坐标四方阵列的高填充挫折。通过优化参数，球形和圆柱形相的区域都被极大地扩展到如此大的体积分数，以至于球形和圆柱形显着变形。我们的工作不仅加深了对 ABC/ABC 共混物自组装机制的理解，而且为制备具有大体积分数的交替球形和圆柱形形态提供了宝贵的指导。
更新日期：2021-09-28
中文翻译：
通过调整二元对称 ABC/ABC 混合来扩展交替的球面和圆柱区域
在正则系综中使用自洽场论研究了由两种不同对称 ABC 三嵌段共聚物组成的二元共混物的自组装，旨在通过调整分子参数来扩展交替的球相和圆柱相的相区。我们的研究证实，球形相的区域受到双分散性的影响，其中长短 A 嵌段（或 C 嵌段）在球形域内形成核壳分布，以增加自发曲率。双色散效应也扩大了交替圆柱体的相位区域。与球形相相比，圆柱区域可以通过双分散 B 块的另一种效果扩展，以释放交替 A/C 圆柱体的低坐标四方阵列的高填充挫折。通过优化参数，球形和圆柱形相的区域都被极大地扩展到如此大的体积分数，以至于球形和圆柱形显着变形。我们的工作不仅加深了对 ABC/ABC 共混物自组装机制的理解，而且为制备具有大体积分数的交替球形和圆柱形形态提供了宝贵的指导。
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