功能化西洛寡合物的末端组 直接块共聚或液晶自组装行为
R Helen Zha1, Bas F M de Waal1, Martin Lutz2
1Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.
Journal of the American Chemical Society
|April 8, 2016
概括
具有尿胺 (UPy) 末端组的单分散寡合体自组合成纳米结构,模仿块共聚物. 分子单分散性对于这种小分子的有序相分离至关重要.
科学领域:
- 聚合物科学
- 材料科学
- 超分子化学
背景情况:
- 具有特定终端组功能的寡合体可以表现出复杂的自我组装行为.
- 已知块共聚物通过相分离形成有序的纳米结构.
- 尿胺 (UPy) 基因是一种强结合单元,能够指导分子组合.
研究的目的:
- 调查与尿胺 (UPy) 基因末端功能化的单分散寡二甲基素的自我组装.
- 将这些小寡合物的自组行为与高分子量块共聚物的行为进行比较.
- 探索终端组结构和分子单分散对纳米结构形成的影响.
主要方法:
- 用UPy末端组合成单分散的寡二甲基.
- 使用小角度X射线散射 (SAXS) 等技术对自组装纳米结构进行表征.
- 分子重量和组成的系统变化以研究相位行为.
主要成果:
- UPy功能化的寡合体自组成有序的纳米结构 (<5 nm域间距),其形态 (叶片状,六角形,体中心立方形) 取决于体积分数不对称性.
- 在这些小分子中实现有序相分离,分子单分散 (分散>1.13) 是必不可少的.
- 由于平面终端组聚合,修改后的UPy衍生物导致类似液晶的板状结构,耐受多分散.
结论:
- 终端组相互作用在指导低分子量寡合物的自我组装方面发挥着关键作用.
- 在UPy功能化的寡合体中,类似块共聚物的自我组装是由相分离效应驱动的,而不是单纯的定向终端组聚.
- 终端功能化的寡合体的设计提供了一条可调节性质的有序纳米结构的途径.
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