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

• 来源期刊: 科学通报(英文版)
• 年，卷（期）: 2008,（18）
• 页码范围: 2770-2776
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s11434-008-0356-8

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.