Synthesis and Direct Visualization of Dumbbell-Shaped Molecular Brushes. Academic Article uri icon


  • 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.

published proceedings

  • ACS Macro Lett

author list (cited authors)

  • Li, A., Li, Z., Zhang, S., Sun, G., Policarpio, D. M., & Wooley, K. L.

citation count

  • 53

complete list of authors

  • Li, Ang||Li, Zhou||Zhang, Shiyi||Sun, Guorong||Policarpio, Danielle M||Wooley, Karen L

publication date

  • January 2012