Influence of Grafting Point Distribution on Self-assembly Morphology of ABA Triblock Copolymer Brush

Ji-hua Xu; Yin-qi Chen; Yu-hua Yin; Run Jiang; Zheng Wang; Bao-hui Li

doi:10.11777/j.issn1000-3304.2019.19204

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Influence of Grafting Point Distribution on Self-assembly Morphology of ABA Triblock Copolymer Brush

更新时间：2021-01-26

- Influence of Grafting Point Distribution on Self-assembly Morphology of ABA Triblock Copolymer Brush
- Acta Polymerica Sinica Vol. 51, Issue 6, Pages: 632-640(2020)
- 作者机构：
  
  1.山东师范大学物理与电子科学学院　济南 250358
  2.南开大学物理科学学院　天津 300071
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19204
  CLC：
- Published：2020-6，
  
  Published Online：13 April 2020，
  
  Received：5 December 2019，
  
  Revised：7 January 2020，
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Ji-hua Xu, Yin-qi Chen, Yu-hua Yin, Run Jiang, Zheng Wang, Bao-hui Li. Influence of Grafting Point Distribution on Self-assembly Morphology of ABA Triblock Copolymer Brush. [J]. Acta Polymerica Sinica 51(6):632-640(2020)
DOI：

Ji-hua Xu, Yin-qi Chen, Yu-hua Yin, Run Jiang, Zheng Wang, Bao-hui Li. Influence of Grafting Point Distribution on Self-assembly Morphology of ABA Triblock Copolymer Brush. [J]. Acta Polymerica Sinica 51(6):632-640(2020) DOI： 10.11777/j.issn1000-3304.2019.19204.

摘要

采用模拟退火方法研究了接枝点分布对ABA 三嵌段共聚物刷在选择性溶剂中自组装形态的影响，其中溶剂对A单体为不良溶剂，对B单体为良溶剂. 主要以高接枝密度体系为例，研究了均匀接枝、区域随机接枝和全随机接枝时共聚物刷聚集体的形态，分别构建了3种接枝方式下体系的相图，并考察了接枝点分布对ABA三嵌段共聚物刷形态的影响机制. 研究表明3种接枝方式下，ABA三嵌段共聚物刷体系形成相图大致相同，并且单层A聚集体结构与双层A聚集体结构在相图中的分界线相同；接枝点分布主要对底部的A富集层胶束形态产生影响，而对顶层胶束形态影响很小. 在随机接枝时，接枝点的密度涨落导致底层A聚集体不易形成较规则的形态，其长程有序性较低.

Abstract

The simulated annealing method was used to study the self-assembly morphology of the symmetrical ABA triblock copolymer brush formed with one end of the A-blocks tethered onto a planar surface. The copolymer brush was immersed in a selective solvent which is poor for the A-blocks but good for the middle B-blocks. Taking the system at high grafting density as an example

the morphology of the copolymer brush aggregates during uniformal grafting

local random grafting and global random grafting were investigated

and the phase diagram was constructed. The simulation studies showed that the position distribution of the grafting point mainly affect the morphology of aggregates near the bottom layer for ABA triblock copolymer brushes. A similar self-assembled morphology could be formed during uniformal grafting

region random grafting

and global random grafting. However

the density fluctuation of the grafting point caused the micelle morphology formed under random grafting

which did not have the regular shape as that formed under uniformal grafting

and the long-range order in the microphase-segregated structures is reduced. The self-assembled morphologies of homopolymer brushes in poor solvent and AB diblock copolymer brushes in the solvent which is selective for the tethered A-blocks but poor for the top B-blocks were also investigated to further understand the results mentioned above.

关键词

三嵌段共聚物刷模拟退火自组装接枝点

Keywords

Triblock copolymer brushSimulated annealingSelf-assemblyGrafting point

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State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology

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