writer：Jie Cui, Jiangping Xu, Yutian Zhu, Wei Jiang
keywords：剪切流, 囊泡, ABA三嵌段共聚物, 形貌多分散性, 自组装, 亚稳态
source：期刊
specific source：Langmuir, 2013, 29(50), 15704-15710
Issue time：2013年

由于体系中存在大量亚稳态，自组装聚合物聚集体通常在形貌上具有多分散性，这成为制备高质量自组装聚合物材料的瓶颈。本文通过模拟与实验表明，亚稳态可以被调控；以两亲性ABA三嵌段共聚物囊泡为例，剪切流可成功控制其形貌多分散性。较高的剪切速率使囊泡更均匀且尺寸更小；但剪切速率过高时，会出现小球体和短棒状聚集体。这些结果加深了对自组装聚合物聚集体亚稳态行为的理解，并为提高囊泡均匀性提供了新策略。

Self-assembled polymeric aggregates are generally polydisperse in morphology due to the existence of many metastable states in the system, which becomes a bottleneck for preparing high-quality self-assembled polymeric materials. In this study, both simulative and experimental results show that the metastable states can be modulated. As a typical example, the morphological polydispersity of amphiphilic ABA triblock copolymer vesicles has been successfully controlled by shear flow. A higher shear rate results in more uniform and smaller vesicles, while extremely high shear rates lead to small spheres and short rods. These findings provide deeper insight into the metastable behavior of self-assembled polymeric aggregates and a new strategy for improving vesicle uniformity.

论文链接：https://doi.org/10.1021/la404186u