Synthesis and Direct Visualization of Dumbbell-Shaped Molecular Brushes
Synthesis and Direct Visualization of Dumbbell-Shaped Molecular Brushes
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DOI：
10.1021/mz200184f
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发表时间：
2012-01-01
影响因子：
7.015
通讯作者：
Wooley, Karen L.
中科院分区：
文献类型：
--
作者：
Li, Ang;Li, Zhou;Wooley, Karen L.
以端降冰片烯基（NB-PLA）为原料，采用开环复分解聚合（ROMP）方法，以顺序加成的方式合成了哑铃状三嵌段分子刷。通过改变大单体尺寸和Grubbs催化剂与大单体的进料比，控制哑铃状分子刷的“球”和“棒”尺寸。通过凝胶渗透色谱（GPC）验证了明确结构的生长和产生，并通过原子力显微镜（AFM）观察了最终的哑铃状结构。这种合成方法代表了一种快速方便的途径来获得独特的大分子拓扑结构。
Dumbbell-shaped triblock molecular brushes were synthesized by ring-opening metathesis polymerization (ROMP) of poly(lactide) macromonomers with terminal norbornene groups (NB-PLA) in a sequential addition manner. By changing the macromonomer size and the feed ratio of Grubbs' catalyst to macromonomer, the dimensions of the "ball" and "bar'' of the dumbbell-shaped molecular brushes were controlled. The growth and production of well-defined structures were verified by gel permeation chromatography (GPC), and the final dumbbell-shaped architectures were visualized by atomic force microscopy (AFM). This synthetic methodology represents a rapid and convenient route to unique macromolecular topologies.