CAJ | 학술논문

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.
통과파최화적Heck우합반응,합성료일충함오이서기단여MEHPV단원적교체공취물(oxa-MEHPV),병이용UV-vis,FT-IR,1H-NMR대기단체화취합물적결구진행료표정,연구료목표취합물적형광성능.유우재MEH-PPV적주련골가상인입오이서기단,oxa-MEHPV분자련적강성득도증강,표현출경호적열은정성능,재상규유궤용액여록방、이록갑완、갑분등중야유경호적용해성.동시,유우오이서구유흔호적전자친화능력,취합물자외흡수파장발생료교대적람이,교MEH-PPV옹유료경호적전자천이솔화경고적형광양자효솔,인이재취합물전치발광(PLED)영역유잠재적응용전경.
A poly ( p-phenylenevinylene ) ( PPV ) alternatingcopolymer, poly [ ( 2, 5-diphenylene-l, 3, 4-oxadiazole )-4-4'-vinylene-alt-2-methoxy-5-( 2-ethylhexyloxy )-1, 4-phenylen-evinylene] (oxa-MEHPV), is synthesized by Heck couplingreaction and characterized with UV-vis, Fourier transforminfrared ( FT-IR ), 1H-NMR and photohiminescence (PL)spectroscopy, oxa-MEHPV possesses an outstanding thermalstability and shows excellent solubility in common organicsolvents such as dichloromethane, chloroform, toluene, andtetrahydrofuran(THF). The introduction of the electron-deficient1, 3, 4-oxadiazole units into the MEH-PPV backbone alsoincreases the electron affinities of the conjugated segment, whichleads to the blue-shift of the maximum absorption wavelength andmakes the polymer have a high optical band-gap energy, goodelectron-transporting stability and high PL quantum yield.