Effects of Chain Dispersity on the Stability of Frank–Kasper Phases Self-Assembled from Diblock Copolymers

IF 2.7 4区化学 Q3 POLYMER SCIENCE Macromolecular Chemistry and Physics Pub Date : 2024-12-23 DOI:10.1002/macp.202400393

Chi To Lai, An-Chang Shi

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Abstract

The effect of chain dispersity on the relative stability of Frank–Kasper (FK) phases self-assembled from diblock copolymers (DBCPs) is studied using self-consistent field theory applied to DBCPs with one disperse block obeying the Poisson or Schulz–Zimm distributions. The results demonstrate that the chain dispersity enhances the relative stability of the FK phases. For DBCPs with small conformational asymmetry, the FK $σ$ phase can be stabilized by dispersity and the stability window of the FK phases widens with the increase of dispersity. For DBCPs with large conformational asymmetry, the Laves C14 and C15 phases, which are metastable in monodisperse DBCPs, can be stabilized by dispersity. An analysis of the spatial organization of polymers reveals that the enhanced stability of the FK phases originated from intra- and inter-domain segregation of chains with different lengths.

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链分散性对二嵌段共聚物自组装Frank-Kasper相稳定性的影响

本文研究了链分散性对双嵌段共聚物（DBCPs）自组装的Frank-Kasper （FK）相相对稳定性的影响，并将自一致场理论应用于单分散嵌段服从泊松分布或舒尔茨-齐姆分布的DBCPs。结果表明，链分散性提高了FK相的相对稳定性。对于构象不对称较小的dbcp， FK σ $\sigma$相可以通过分散度稳定，且FK相的稳定窗口随着分散度的增大而变宽。对于构象不对称较大的DBCPs， Laves C14和C15相在单分散DBCPs中是亚稳的，可以通过分散性来稳定。对聚合物空间组织的分析表明，FK相稳定性的增强源于不同长度链的域内和域间偏析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecular Chemistry and Physics 化学-高分子科学

CiteScore

4.30

自引率

4.00%

发文量

278

审稿时长

1.4 months

期刊介绍： Macromolecular Chemistry and Physics publishes in all areas of polymer science - from chemistry, physical chemistry, and physics of polymers to polymers in materials science. Beside an attractive mixture of high-quality Full Papers, Trends, and Highlights, the journal offers a unique article type dedicated to young scientists – Talent.