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• W2005058216 abstract "The first novel polyfluorene copolymers containing siloxane bridges were synthesized by Ni(0)-mediated copolymerization between 2,7-dibromo-9,9‘-dihexylfluorene and a bridged fluorene monomer containing siloxane linkages. Two such bridged copolymers were prepared: PSiloBg1 (containing 1 mol % siloxane-bridged fluorene unit) and PSiloBg3 (containing 3 mol % siloxane-bridged fluorene unit). PSiloBg1 and PSiloBg3 exhibited good solubility in common organic solvents, thermal stability up to 420 °C, and facile film formation. The glass transition temperatures of the bridged polymers (106 and 110 °C, respectively) were higher than that of the homo poly(dihexylfluorene) (PDHF). In particular, PSiloBg3 exhibited a polymerization yield (96%) and a molecular weight (MW = 185 000) higher than those of PDHF (polymerization yield = 62%, MW = 82 000). Interestingly, after the bridged polymers had been annealed at 150 °C for 4 h in air, their PL spectra showed no significant increase in vibronic structures at 450 and 475 nm and no evidence of aggregation formation and excimers at wavelengths of >500 nm. In addition, the full width at half-maximum (fwhm) of the bridged polymers was very small (fwhm = 51−52 nm) compared to that of PDHF (fwhm = 85 nm). Collectively, the results show that the polyfluorenes with siloxane bridges exhibit thermally stable almost pure blue emission, making these polymers promising candidate materials for device applications." @default.
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• W2005058216 date "2003-08-15" @default.
• W2005058216 modified "2023-09-28" @default.
• W2005058216 title "Synthesis and Characterization of Thermally Stable Blue Light-Emitting Polyfluorenes Containing Siloxane Bridges" @default.
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• W2005058216 doi "https://doi.org/10.1021/ma034622r" @default.
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