Synthesis and properties of hyperbranched poly (triphenylamine)s prepared by palladium catalyzed C-N coupling reaction

被引:28
作者
Jikei, M
Mori, R
Kawauchi, S
Kakimoto, M [1 ]
Taniguchi, Y
机构
[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528550, Japan
[2] Shinshu Univ, Dept Funct Polymer Sci, Ueda, Nagano 3868567, Japan
关键词
hyperbranched polymer; triphenylamine; C-N coupling; palladium catalyst; EL device;
D O I
10.1295/polymj.34.550
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Hyperbranched poly (triphenylamine)s with various end functional groups were prepared starting from 4,4'-diamino-4"-bromotriphenylamine through palladium catalyzed C-N coupling reaction, The self-polycondensation of the monomer afforded secondary amino groups predominantly. End-capped polymers were isolated by the chemical modification of unreacted amino groups by acid chlorides. The proper-ties of the hyperbranched poly(triphenylamine)s, such as solubility, thermal stability and ionization potential, were dependent on the end functional group,,. The hyperbranched poly (triphenylamine) s were examined as a hole transporting material for organic light emitting diodes. The multi-layered device composed of ITO/hyperbranched poly(triphenylamine)/Alq(3)/Mg-Ag showed yellow-green emission derived from Alq(3). The device performance was improved when the polymer end-capped with alkyl chlorides were used as a hole transporting material. Since the ionization potentials of the hyperbranched polymer with alkyl amide end groups were higher than that with aromatic amide end groups, efficient hole injection from ITO/hyperbranched poly(triphenylamine)/Alq(3) might be achieved to improve the device performance.
引用
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页码:550 / 557
页数:8
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