含氰基三联苯的给体-受体甲壳型共轭聚合物的合成与性能  

Synthesis and Characterization of Donor-Acceptor Mesogen-Jacketed Conjugated Polymers Containing Cyanoterphenyl

作　　者：战宝柱 万里鹰[1] 韩荣梅[1] 易凡 席冰冰 Baozhu Zhan;Liying Wan;Rongmei Han;Fan Yi;Bingbing Xi(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《高分子材料科学与工程》2020年第9期73-80,共8页Polymer Materials Science & Engineering

基　　金：江西省重点研发计划(CK201601140);国家自然科学基金资助项目(51463016)。

摘　　要：聚合物主链为给电子单元(芴、咔唑),三联苯侧链末端基团引入氰基吸电子基团,合成了新型给体-受体单元的甲壳型共轭聚合物P1、P2。同时,为改善聚合物分子链一定程度的扭曲,增加主链和侧链的共轭程度,在给体与受体单元之间插入噻吩π桥,通过Stille偶联反应,合成了2种含有噻吩桥的给体-受体单元甲壳型共轭聚合物P3、P4。采用~1H-NMR表征单体及聚合物的化学结构,同时测试了聚合物的热稳定性能、光学性能和电学性能。聚合物P1、P2、P3、P4均具有良好的热稳定性,热分解温度均在350℃以上。分子结构中的给体-受体单元,形成推-拉电子效应,降低带隙,其中P4带隙降至1.89 eV。在紫外-可见区有较宽的吸收和发射峰,P3、P4薄膜最大吸收峰波长为458 nm,P4薄膜最大荧光发射峰波长为546 nm,以上结果表明新型甲壳型共轭聚合物是一种潜在的电致发光新材料。Mesogen-jacketed conjugated polymers P1 and P2 with donor-acceptor units were synthesized by introducing cyanogen acceptor groups into the terminal groups of terphenyl side chains.At the same time,in order to improve non-twisted molecular chain and increase the conjugation degree between the main chains and side chains,two mesogen-jacketed conjugated polymers P3 and P4 containing thiophene in main chain were synthesized by inserting thiophene-pi bridges between donor and acceptor units through Stille coupling reaction.~1H-NMR was used to characterize the chemical structures of the monomers and polymers,the thermal stability,optical and electrical properties of the polymers were tested.P1,P2,P3 and P4 have good thermal stability,the decomposition temperatures of polymers are all above 350℃.Because of push-pull effect caused by the donor-acceptor units in the molecular structure,the band gaps of polymers are narrow and the band gap of P4 decreases to 1.89 eV.Furthermore,the polymers have wide absorption and emission peaks in the ultraviolet-visible region,the maximum absorption peak wavelength of P3 and P4 films is 458 nm,and the maximum fluorescence emission peak wavelength of P4 film is 546 nm.This indicates that the new mesogen-jacketed conjugated polymers are potential electroluminescent materials.

关 键 词：给体-受体 共轭聚合物 三联苯 芴 咔唑 

分 类 号：TQ317[化学工程—高聚物工业]