Combined techniques for the characterization of polyfluorene copolymers and correlaction whit their optical properties. Part 1 (Contributo in atti di convegno)

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  • Combined techniques for the characterization of polyfluorene copolymers and correlaction whit their optical properties. Part 1 (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
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  • F.Samperi, S.Battiato, C.Puglisi, S.Destri, U.Giovanella, M.C.Pasini, R.Mendichi (2011)
    Combined techniques for the characterization of polyfluorene copolymers and correlaction whit their optical properties. Part 1
    in XX Convegno Italiano di Scienza e Tecnologia delle Macromolecole (AIM), TERNI
    (literal)
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  • F.Samperi, S.Battiato, C.Puglisi, S.Destri, U.Giovanella, M.C.Pasini, R.Mendichi (literal)
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  • 4 - 8 Settembre 2011. (Conference Proceeding -Oral) (literal)
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  • Abstract: The energy demand is continuously growing up while the present energy sources are largely pollutant and limited. Hence, it is mandatory both to find out new alternative sources and try to reduce energy consumption. In this view the preparation of conjugated polymeric materials and their deep characterization becomes more and more important in order to correlate molecular properties with the optoelectronic ones. In this contribute polyfluorenes are considered because they are one of the most used materials for polymeric OLED fabrication. In particular these polyfluorenes allow for fabrication of white OLED which can be used for solid-state lighting and contribute to energy saving. Two series of fluorene based copolymers containing the benzothiadiazole units (Bzt; green chromophore) or the read chromophore (bisthien-2yl)-benzothiadiazole units (T-Bzt-T) along the chains, were synthesized by Suzuki coupling reaction of tailored polyfluorene pre-polymers (PF) essentially terminated with propane boronic ester groups (PF sample) with the di-bromine derivative of the Bzt and TBzt-T monomers, in presence of tetrakis(triphenylphosphine) palladium ((Ph3P)4Pd) as catalyst. Two tailored PF pre-polymers constituted of alternated triphenylammino disubstituted fluorene units and dialkylsubstituted fluorine units were preliminary synthesized by Suzuki coupling reactions of equimolar ratio of 9,9-bis(4-diphenylaminophenyl)-2,7-dibromofluorene (1) and 2-(4,4,5,5-tetramethyl-1,3,2-dioxoborolane)-9,9-dioctylfluorene (2) in toluene solvent, using the same Pd catalyst, K2CO3 2 M and of a catalytic amount of Aliquat. After 6 or 10 h of reaction (depending on the run ) at 90°C, the bromine end group was quenched by adding phenylboronic acid pinacol ester in different ratios (1:1 or 1:3 with respect to the monomer equivalent) and stirring for 12 h or 18h at 90 °C in the two runs, respectively. Thus two PF samples with an wight average molar mass (Mw) of 5200 and 12700 g/mol, respectively, were obtained with the aim to better modulate the energy transfer to get white emission. These PFs were used to synthesize two series of polyfluorene based copolymers containing the green chromophore Bzt or the read chromophore one Tf-Bzt-Tf along the chains, by Suzuki coupling reaction with the di-bromine derivative of the Bzt and Tf-Bzt-Tf monomers respectively, in presence of ((Ph3P)4Pd) as catalyst. The average molar masses of all samples were calculated by SEC using THF as mobile phase, and two on-line detectors: (1) differential viscometer (DV); (2) differential refractometer (DRI model 2414). The chemical composition of the PFs and the copolymers (referred as PF-Bz and PF-(Tf-Bz- Tf)) were investigated by (1H and 13C) NMR and MALDI-TOF Mass Spectrometry tools (MALDI-TOF MS). In particular, the MALDI-TOF MS analysis of the neat polymers and copolymers and of the their narrow polydisperse fractions obtained by SEC fractionation gave peculiar information on their composition and on the side reactions occurring during the syntheses of the PF pre-polymers. The optical characterization (UV visible absorption and Photoluminescence) of the neat copolymers and of their SEC fractions were also performed and the data will be discussed in another contribute (see Combined techniques for the characterization of polyfluorene copolymers and correlaction whit their optical properties. Part 2 - Spectroscopy Measurements). (literal)
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Titolo
  • Combined techniques for the characterization of polyfluorene copolymers and correlaction whit their optical properties. Part 1 (literal)
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  • 978-88-95028-83-5 (literal)
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