Abstract:
A kind of phenylethynylpendentdecorated conjugated polymer, consisting of alternating fluorene and triphenylamine gorups, poly(9,9-dioctyl)2,7-fluoreneco-N-4-phenylethenyl-4,4'-tripheny-lamine(PFT-PE), was successfully synthesized via Suzuki coupling reaction. The chemical structure of PFTPE was verified by NMR and FTIR analyses. The polymer is highly soluble in common organic solvents, and exhibits good filmforming ability and thermal stability. The optical bandgap of this polymer is 2.82 eV, as deduced by its absorption onset. The PL spectrum of PFT-PE′s film showed substantial redshift and broadening as relative to that of its THF solution, indicating the presence of intermolecular aggregation in solid state. The highest occupied molecular orbital (HOMO) level of PFT-PE is about -5.39 eV, as calculated by the oxidation onset of its CV curve. The highly reversible oxidation process indicates the good electrochemical stability PFTPE possesses. PFT-PE can be thermally cured without the addition of any initiator due to the substitution of phenylethynyl pendant.