Synthesis and optical properties of an alternating copolymer composed of MEHPV and 1,3,4-oxadiazole  

一种含噁二唑基团MEHPV交替共聚物的合成及其荧光性能(英文)

作　　者：王华林[1] 孙岳明[1] 祁争健[1] 蒋伟[1] 宋坤忠[1] 李大雁[1] 

机构地区：[1]东南大学化学化工学院,南京211189

出　　处：《Journal of Southeast University(English Edition)》2008年第2期238-242,共5页东南大学学报（英文版）

基　　金：The National Basic Research Program of China(973Program)(No.2007CB936300);the High Technology Research and Devel-opment Program of Jiangsu Province(No.BG2006033).

摘　　要：A poly （ p-phenylenevinylene ） （ PPV ） alternating copolymer, poly [ （ 2, 5-diphenylene-1, 3, 4-oxadiazole ）-4-4＇ - vinylene-alt-2-methoxy-5-（ 2-ethylhexyloxy ）-1, 4-phenylenevinylene] （oxa-MEHPV）, is synthesized by Heck coupling reaction and characterized with UV-vis, Fourier transform infrared （ FT-IR ）, ^1H-NMR and photoluminescence （ PL ） spectroscopy, oxa-MEHPV possesses an outstanding thermal stability and shows excellent solubility in common organic solvents such as dichloromethane, chloroform, toluene, and tetrahydrofuran（THF）. The introduction of the electron-deficient 1, 3, 4-oxadiazole units into the MEH-PPV backbone also increases the electron affinities of the conjugated segment, which leads to the blue-shift of the maximum absorption wavelength and makes the polymer have a high optical band-gap energy, good electron-transporting stability and high PL quantum yield.通过钯催化的Heck耦合反应,合成了一种含噁二唑基团与MEHPV单元的交替共聚物(oxa-MEHPV),并利用UV-vis,FT-IR,1H-NMR对其单体和聚合物的结构进行了表征,研究了目标聚合物的荧光性能.由于在MEH-PPV的主链骨架上引入噁二唑基团,oxa-MEHPV分子链的刚性得到增强,表现出更好的热稳定性能,在常规有机溶液如氯仿、二氯甲烷、甲苯等中也有更好的溶解性.同时,由于噁二唑具有很好的电子亲和能力,聚合物紫外吸收波长发生了较大的蓝移,较MEH-PPV拥有了更好的电子迁移率和更高的荧光量子效率,因而在聚合物电致发光(PLED)领域有潜在的应用前景.

关 键 词：MEH-PPV 1  3  4-oxadiazoles units electron injection PHOTOLUMINESCENCE polymer light-emitting diode 

分 类 号：O361[理学—流体力学] TN383.1[理学—力学]