Hyperbranched polymer-cored star polyfluorenes as blue light-emitting materials  

作　　者：HAN Yang SUN MingHao FEI ZhuPing BO ZhiShan 

机构地区：[1]Beijing National Laboratory for Molecular Sciences, and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Chinese Science Bulletin》2008年第18期2770-2776,共7页

基　　金：the National Natural Science Foundation of China (Grant Nos. 20574075, 20774099, 20423003 and 50521302)

摘　　要：Hyperbranched polymer-cored star polyfluorenes with high molecular weights and narrow molecular weight distribution were prepared by palladium-catalyzed one-pot Suzuki polycondensation of multi- functional cores and an AB-type monomer. The optical, electrochemical and thermal properties of the hyperbranched polymer-cored star polymers were investigated. These polymers exhibited good ther- mal and color stability in solid state, and there was no significant blue-green emission after the poly- mers had been annealed in air for 2.5 h. Their three-dimensional hyperbranched structures could ef- fectively reduce the aggregation of the peripheral rigid linear conjugated polyfluorene chains.Hyperbranched polymer-cored star polyfluorenes with high molecular weights and narrow molecular weight distribution were prepared by palladium-catalyzed one-pot Suzuki polycondensation of multi-functional cores and an AB-type monomer. The optical, electrochemical and thermal properties of the hyperbrenched polymer-cored star polymers were investigated. These polymers exhibited good thermal and color stability in solid state, and there was no significant blue-green emission after the polymers had been annealed in air for 2.5 h. Their three-dimensional hyperbranched structures could elfectively reduce the aggregation of the peripheral rigid linear conjugated polyfluorene chains.

关 键 词：发光二极管 聚合物 星形高聚物 缩聚作用 

分 类 号：O64[理学—物理化学]