以四氯駢苯二醯亞胺做為架橋之聚芴高分子之合成，光學性質及電化學性質研究

Synthesis, Optical and Electrochemical Properties of Polyfluorenes Containing Tetrachloroperylene Bisimide as Bridging Moiety

王永俊

聚芴 ； 四氯駢苯二醯亞胺 ； 超分枝高分子 ； Polyfluorene ； Tetrachloroperylene bisimide ； Hyperbranched polymer

交通大學光電系統研究所學位論文

2011年

碩士

楊勝雄

繁體中文

本研究之目的在合成出以四氯駢苯二醯亞胺做為架橋之聚芴超分枝高分子，並探討其高分子分子量、光學性質及電化學性質。凝膠滲透層析的量測結果顯示，引入含四氯駢苯二醯亞胺做為架橋之後，高分子之Mn及Mw分別增加83%及1.5倍，然而分子量分佈也變大；而引入含長碳鏈做為架橋之後，其分子量成長幅度較小。TGA及DSC的結果顯示超分枝高分子結構使其熱穩定性提升。紫外光－可見光吸收光譜產生藍位移現象乃由於引入架橋，使聚芴的平面性降低。然而螢光光譜沒有明顯的差別，薄膜態的最大放射峰位於438 nm附近。HOMO能階主要由聚芴所決定，因此三者非常接近；此外四氯駢苯二醯亞胺的引入，會使電洞與電子的傳輸特性較相近，增加元件效率。

The goal of this research is aimed to synthsize hyperbranched polyfluorenes containing tetrachloroperylene bisimide as bridging moiety, and to investigate their molecular weights, optical properties, and electrochemical properties. The GPC results show that Mn and Mw increase about 83% and 150% after incorporating tetrachloroperylene bisimide as bridging moieties; however, the PDI values also increase. On the other hand, the growth of molecular weights is smaller by introduction of bridging moieties containing alkyl spacers. The TGA and DSC data reveal that hyperbranched structure improves the thermal stabilities of synthesized polymers. The UV-vis absorption spectra are blue-shifted in thin film due to the decrease of planarity of polyfluorene by introducing bridging moieties. However, the difference in PL spectra of three polymers is insignificant, showing emission maxima at 438 nm in thin film. The HOMO level of three polymers is very close since it is mainly determined by polyfluorene main chains. Besides, PL spectra and EL spectra are similar, it means that they have the same luminescence mechanism. The current yield and brightness are increased by introducing PBI as bridging moieties. PBI is a electron transport materials , it makes that the hole-injected rate and the electron-injected rate are became near.

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