Poly[2,7-(9,9-dihexylfluorene)]-block-poly(2-vinylpyridine) rod-coil star-block copolymers: Synthesis, micellar structures, and photophysical properties
Journal
Macromolecular Chemistry and Physics
Journal Volume
212
Journal Issue
3
Pages
297-304
Date Issued
2011
Author(s)
Abstract
Abstract The first successful synthesis of conjugated rod–coil star block copolymer, (PF‐ b ‐P2VP) n , containing conjugated poly[2,7‐(9,9‐dihexylfluorene)] (PF), and coil‐like poly(2‐vinylpyridine) (P2VP) by combining a Suzuki coupling reaction and living anionic polymerization is reported. With increasing methanol content in THF/methanol mixtures (PF‐ b ‐P2VP) n symmetric star‐block copolymers maintain spherical micelles, but PF‐ b ‐P2VP asymmetric diblock copolymers vary from spherical micelles to vesicles. Both the absorption and emission spectra of PF‐ b ‐P2VP blue shift with increasing methanol content, suggesting an “H‐type” aggregation. However, (PF‐ b ‐P2VP) n star‐block exhibits no shift in absorption but a red shift in the emission spectra, indicating a different type of aggregation. These results suggest the significance of polymer architectures on microphase‐separated morphologies and photophysical properties. magnified image
Type
journal article