Synthesis and Characterization of 9,9′-Diarylfluorene Hyperbranched Polymers

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (5): 1023.

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Synthesis and Characterization of 9,9′-Diarylfluorene Hyperbranched Polymers

JIN Jia¹, WU Yong-Gang^1*, BA Xin-Wu¹, BO Zhi-Shan^2*

1. College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;
2. State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received:2009-09-16 Online:2010-05-10 Published:2010-05-10
Contact: WU Yong-Gang. E-mail: yonggangwu@iccas.ac.cn; BO Zhi-Shan. E-mail: zsbo@iccas.ac.cn
Supported by:
国家自然科学基(批准号: 200904008)和河北省教育厅基金(批准号: 2009307)资助.

Abstract

Abstract:

Starting from 2,7-dibromofluorene, two aryl substituents were introduced to the 9-position of fluorene to replace the commonly used alkyl groups so as to increase the stability of fluorene. New hyperbranched polymers that exhibited excellent thermal and luminescent stability were synthesized using newly designed monomers through the “AB₂+AB” approach. The decomposition temperatures of all hyperbranched polymers are above 400 ℃. The polymer films heated at 200 ℃ in air for 2 h were not observed green emission band. Compared with alkyl substituted polyfluorenes, the luminescence stability has a marked improvement. DSC results show that linear polymers have a glass transition at 170 ℃, but hyperbranched polymers do not have an obvious phase transition under 300 ℃, indicating hyperbranched polyfluorenes form amorphous films, which help to improve the efficiency of PLEDs.

Key words: Polyfluorene; Hyperbranched polymer; Green emission band

TrendMD:

JIN Jia, WU Yong-Gang*, BA Xin-Wu, BO Zhi-Shan*. Synthesis and Characterization of 9,9′-Diarylfluorene Hyperbranched Polymers[J]. Chem. J. Chinese Universities, 2010, 31(5): 1023.

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Synthesis and Characterization of 9,9′-Diarylfluorene Hyperbranched Polymers

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