Synthesis and Thermal Properties of Macrocyclic Poly(9,9-dimethyl-2-vinylfluorene) Containing Single 1,4-Benzylidene or 9,10-Anthracenylidene Linking Units
摘要:
Narrow distribution macrocyclic poly(9,9-dimethyl-2-vinylfluorene) (PDMVF) and the matching linear precursors with the same degree of polymerization (DPn from 12 to 145) were synthesized via anionic polymerization followed by the end-to-end coupling with 1,4-bis(bromomethyl)benzene (DBX) or 9,10-bis(chloromethyl)anthracene (BCMA). The molecular characterization was carried out by size exclusion chromatography (SEC), proton NMR, and ALUM. The ratios of apparent molecular weights (MW's) of the macrocycles and those of the matching linear polymers decreased with increasing molecular weights as seen with other vinylaromatic macrocycles. However, in contrast to all other vinylaromatic macrocycles, the PDMVF macrocycles showed increases in glass transition temperature with decreasing MW.
The present invention provides an organic EL device utilizing phosphorescence which can be driven at a low voltage, which realizes high luminance and high efficiency, and which has a long lifetime. The organic EL device of the present invention includes an organic light-emitting layer composed of at least a host material and a dopant, wherein the dopant is a phosphorescent compound containing a halogen atom, and the host material is a linear aromatic compound having no aromatic substituent at a side thereof.
Synthesis and Thermal Properties of Macrocyclic Poly(9,9-dimethyl-2-vinylfluorene) Containing Single 1,4-Benzylidene or 9,10-Anthracenylidene Linking Units
作者:Rong Chen、Xi Zhang、Thieo E. Hogen-Esch
DOI:10.1021/ma0301606
日期:2003.10.1
Narrow distribution macrocyclic poly(9,9-dimethyl-2-vinylfluorene) (PDMVF) and the matching linear precursors with the same degree of polymerization (DPn from 12 to 145) were synthesized via anionic polymerization followed by the end-to-end coupling with 1,4-bis(bromomethyl)benzene (DBX) or 9,10-bis(chloromethyl)anthracene (BCMA). The molecular characterization was carried out by size exclusion chromatography (SEC), proton NMR, and ALUM. The ratios of apparent molecular weights (MW's) of the macrocycles and those of the matching linear polymers decreased with increasing molecular weights as seen with other vinylaromatic macrocycles. However, in contrast to all other vinylaromatic macrocycles, the PDMVF macrocycles showed increases in glass transition temperature with decreasing MW.