Electrochemical Synthesis And Characterization Of Novel Polythiophene And Polyfluorene Material

Conjugated polymers continue to attract great interest of many scientists. Withthe development of science and technology, conductive polymer materials are fullyutilized in electroluminescent devices, promoting the application and development oforganic semiconductors. Polythiophenes (PTs) and their derivatives, as a class ofconducting polymers, have attracted considerable attention due to their goodconductivity and chemical stability; Polyfluorene and its derivatives have beenconsidered promising candidates as blue-light-emitting materials. Because of theirhighly efficient photoluminescence and electroluminescence, thermal and oxidativestability, good solubility, and emission of polarized blue light, they are especiallysuitable for applications to polymer light emitting diodes. This dissertation mainlyfocused on the electrosynthesis and characterization of high-quality conductingpolymers.1. The precursor polymer, a polymethacrylate functionalized with thiophene,poly[3-(hexyl methacrylate)]thiophene (P3HMAT), was synthesized and thenelectropolymerized on ITO substrates in boron trifluoride diethyl etherate(BFEE)/CH2Cl2(v/v=6:4) binary solution system, resulting in poly{poly[3-(hexylmethacrylate)]thiophene}(PP3HMAT). The possibility of inter-and intramolecularpolymerization resulted in a cross-linking conjugated network microstructure.UV-visible and FT-IR spectra were used to study the structures of the polymers,respectively. The fluorescence spectra indicated that PP3HMAT films can be used asyellow-green-light emitters even they could not be dissolved in common solvents. Thethermal analyses demonstrated that PP3HMAT has good thermal stability.2. Poly[N-(9-fluorenylmethoxycarbonyl)-L-phenylalanine](PN9FPA) films withgood fluorescence properties and chirality were prepared electrochemically by directanodic oxidation of N-(9-fluorenylmethoxycarbonyl)-L-phenylalanine (N9FPA) inboron trifluoride diethyletherate (BFEE). Fourier transform infrared spectroscopymeasurement showed that the polymerization of N9FPA occurred mainly at the C (2)and C (7) positions. The fluorescence spectra indicated that PN9FPA films wereblue-light emitters. The thermal analyses demonstrated that PN9FPA has good thermalstability. In addition, the structures and properties of the monomer and the polymerswere characterized and evaluated with CV, UV, TGA and SEM. 3. Poly[N-(9-Fluorenylmethoxycarbonyl)-L-alanine](PN9FA) films with goodfluorescence properties and chirality were prepared electrochemically by direct anodicoxidation of N-(9-Fluorenylmethoxycarbonyl)-L-alanine (N9FA) in boron trifluoridediethyletherate (BFEE). The results of FT-IR spectral had investigated that N9FA wasprobably polymerized through the coupling at C (2) and C (7) positions. Results ofelectrochemical measurements of PN9FA showed good redox activity and stability.The fluorescence spectra indicated that PN9FA films were blue-light emitters. Thethermal analyses demonstrated that PN9FA has good thermal stability. In addition, thestructures and properties of the monomer and the polymers were characterized andevaluated with CV, UV and SEM.