Droplet-like Defect Annihilation Mechanisms in Hexagonal Cylinder-Forming Block Copolymers,ACS Macro Letters

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Droplet-like Defect Annihilation Mechanisms in Hexagonal Cylinder-Forming Block Copolymers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-03-24 , DOI: 10.1021/acsmacrolett.1c00670
Yongzhi Ren _{1,

2} , Weihua Li ₃

Affiliation

The annihilation of typical individual defects in hexagonal cylinder-forming block copolymers is investigated using the self-consistent field theory (SCFT) in conjunction with the string method. Usually, defect removal in two-dimensional hexagonal patterns involves reorganizing the cylindrical domains. Unlike atoms in solid crystals, the self-assembled cylindrical domains of block copolymers are “soft”. Thus, the kinetic motions of the cylindrical domains resemble liquid droplets. Dislocations in hexagonal patterns are eliminated via creating and removing cylindrical domains. Our results show that new cylindrical domains are created via either a nucleation-like process or a fission-like process, whereas excessive domains are eliminated via a fusion-like or evaporation-like process. For weakly segregated block copolymers, the nucleation-like and evaporation-like processes are preferred.

中文翻译：

六方圆柱嵌段共聚物中液滴状缺陷的消除机制

使用自洽场理论 (SCFT) 结合弦法研究了六方圆柱体形成嵌段共聚物中典型个体缺陷的消除。通常，二维六边形图案中的缺陷去除涉及重新组织圆柱形域。与固体晶体中的原子不同，嵌段共聚物的自组装圆柱形域是“软的”。因此，圆柱形域的动力学运动类似于液滴。通过创建和去除圆柱形域来消除六角形图案中的位错。我们的结果表明，新的圆柱形域是通过类核过程或类裂变过程产生的，而过多的域是通过类聚变或类蒸发过程消除的。对于弱偏析嵌段共聚物，

更新日期：2022-03-24

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