Synthesis of Low Polydispersity Polyfluorene and Their Block Copolymer via Coupling Reaction
Date Issued
2009
Date
2009
Author(s)
Chen, Li-Ting
Abstract
In the thesis, a series of low polydispersity poly(9,9-di-n-octyl-2,7-fluorene) (PFO) was synthesized by Suzuki-Miyaura coupling reaction, and was tried to use arylpalladium(II) halide complexes with formyl group as catalysts to convert aldehyde-terminated PFO. In addition, a monodispersed homopolymer living anion of poly(2-vinyl pyridine) (P2VP) was synthesized via anionic polymerization using sec-butyllithium as an initiator. Block copolymers of PFO-b-P2VP were synthesized by a nucleophilic addition reaction between P2VP living anion and aldehyde-terminated PFO. Two PFO-b-P2VP block copolymers with different PFO/P2VP molar ratio were successfully synthesized with high yield. The synthesized PFO and PFO-b-P2VP were characterized by using various techniques including Gel Permeation Chromatography (GPC), MALTI-TOF, UV-Vis, Photoluminescence (PL), Thermogravimetric Analyzer (TGA), Differential Scanning Calorimeter (DSC). Furthermore, we used the small angle X-ray scattering (SAXS), wide angle X-ray scattering (WAXS) and Transmission Electron Microscope (TEM) techniques to study the crystalline structures of homo PFO and PFO in the PFO-b-P2VP nanostructures, and used Polarized Optical Microscopy (POM) to observe phase transition phenomenon. It was found that the different properties and microstructures of PFO and their block copolymers.
Subjects
rod-coil block copolymer
poly(9,9-di-n-octyl-2,7-fluorene)
poly(2-vinyl pyridine)
anionic polymerization
end-coupling reaction
crystalline structure
nanostructure
Type
thesis
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