Synthesis and Direct Visualization of Dumbbell-Shaped Molecular Brushes

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• 作者：Ang Li ; Zhou Li ; Shiyi Zhang ; Guorong Sun ; Danielle M. Policarpio ; Karen L. Wooley
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：January 17, 2012
• 年：2012
• 卷：1
• 期：1
• 页码：241-245
• 全文大小：240K
• 年卷期：v.1,no.1(January 17, 2012)
• ISSN：2161-1653

文摘

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鈥?catalyst to macromonomer, the dimensions of the 鈥渂all鈥?and 鈥渂ar鈥?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.