三维软约束下对称二嵌段共聚物的相行为。

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2024-11-18 DOI:10.1039/D4SM01020E
Zhijuan He, Jin Huang, Kai Jiang and An-Chang Shi
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引用次数: 0

摘要

利用自洽场理论研究了对称二嵌段共聚物在三维(3D)软约束下的相行为。在由 AB 二嵌段共聚物和 C 均聚物组成的二元共混物中实现了软约束,共聚物自组装形成了嵌入均聚物基体中的液滴。封闭嵌段共聚物的相行为受封闭程度和均聚物选择性的影响,从而产生了丰富多样的新型结构。当 C 均聚物与 A 嵌段和 B 嵌段呈中性时,会形成叠层(SL),层数随液滴体积的增加而增加,从而形成从 Janus 颗粒到方形 SL 的形态转变序列。当 C 均聚物对 B 嵌段具有强烈选择性时,就会出现一系列非层状形态,包括洋葱状、汉堡包状、交叉状、环状和饼干状结构。详细的自由能分析表明,当均聚物的选择性发生改变时,SL 结构和类洋葱(OL)结构之间会发生一阶可逆转变。我们的研究结果让人们全面了解了共聚物浓度、均聚物链长、密闭程度和均聚物选择性等各种因素如何影响二嵌段共聚物在软三维密闭条件下的自组装结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Phase behavior of symmetric diblock copolymers under 3D soft confinement

Phase behavior of symmetric diblock copolymers under 3D soft confinement

The phase behavior of symmetric diblock copolymers under three-dimensional (3D) soft confinement is investigated using self-consistent field theory. Soft confinement is realized in binary blends composed of AB diblock copolymers and C homopolymers, where the copolymers self-assemble to form a droplet embedded in a homopolymer matrix. The phase behavior of the confined block copolymers is regulated by the degree of confinement and the selectivity of the homopolymers, resulting in a rich variety of novel structures. When the C homopolymers are neutral to the A- and B-blocks, stacked lamellae (SL) are formed where the number of layers increases with the droplet volume, resulting in a morphological transition sequence from Janus particles to square SL. When the C homopolymers are strongly selective for the B-blocks, a series of non-lamellar morphologies, including onion-, hamburger-, cross-, ring-, and cookie-like structures, are observed. A detailed free energy analysis reveals a first-order reversible transformation between SL and onion-like (OL) structures when the selectivity of the homopolymers is changed. Our results provide a comprehensive understanding of how various factors, such as the copolymer concentration, homopolymer chain length, degree of confinement, and homopolymer selectivity, affect the self-assembled structures of diblock copolymers under soft 3D confinement.

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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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