Polymer Micelles Composed of Molecular‐Bottlebrush‐Based Surfactants: Precisely Controlling Aggregation Number Corresponding to Polyhedral Structures
Polymer Micelles Composed of Molecular‐Bottlebrush‐Based Surfactants: Precisely Controlling Aggregation Number Corresponding to Polyhedral Structures
复制标题
由分子刷式表面活性剂组成的聚合物胶束：精确控制与多面体结构相对应的聚集数
DOI：
10.1002/marc.202100285
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发表时间：
2021
影响因子：
4.6
通讯作者：
Sakurai Kazuo
中科院分区：
文献类型：
--
作者：
Fujii Shota;Eichhorn Jonas;Schacher Felix H.;Brendel Johannes C.;Sakurai Kazuo
在过去的几十年里，超分子化学领域在构建自组装方面取得了显著的进展，例如具有精确控制和精细结构的胶束。一种有希望的方法代表了先前提出的柏拉图胶束的概念，其中聚集数(NAG)根据正多面体(即柏拉图固体)的顶点离散，即4、6、8、12和20个单元。在这里，试图使用刚性和持久性结构的分子瓶刷表面活性剂(MBS)来构建柏拉图式聚合物胶束。利用小角X射线、光散射和分析离心法对MBS胶束的结构进行了详细的研究。研究表明，当Naggis有意设置在4-20范围内时，MBS胶束的Nagg值与柏拉图数中的一个一致。此外，随着盐浓度的变化，部分MBS胶束的Nagg呈现不连续的变化，这是控制胶束Nagg的一个重要因素。这是柏拉图胶束在表面活性剂体系中的特征聚集行为之一，这有力地表明了大分子表面活性剂形成了柏拉图胶束。
Over the past few decades, there has been remarkable progress in the construction of self‐assemblies in the field of supramolecular chemistry, such as micelles with precisely controlled and refined structures. One promising approach represents the previously proposed concept of Platonic micelles, in which the aggregation number (Nagg) is discretized in accordance with vertexes of regular polyhedra (i.e., Platonic solids), i.e., 4, 6, 8, 12, and 20 units. Herein, attempt is made to construct Platonic polymer micelles using rigid and persistent architecture of molecular‐bottlebrush‐based surfactant (MBS). The structure of MBS micelles is carefully elucidated using small‐angle X‐ray and light scattering and analytical centrifugation measurements. This study shows that theNaggof MBS micelles is consistent with one of the Platonic numbers whenNaggis intentionally set in the range of 4–20. In addition, some of the MBS micelles demonstrate a discontinuous change inNagg, when the salt concentration is changed, which is an important factor in controlling micellarNagg. This is one of the characteristic aggregation behaviors of Platonic micelles in surfactant systems, which strongly indicates the formation of Platonic micelles from macromolecular surfactants.