金刚烷双溴化物改性聚芴的Suzuki偶联聚合及光致发光性能

通过Suzuki偶联聚合反应合成了3种具有较高相对分子质量的主链含金刚烷共聚单体的聚芴P1~3,聚合产率均在90%以上。热重分析表明,P1~3的分解温度分别达到412、420和430℃。紫外和光致发光(PL)光谱表明,改性后的聚芴比均聚物聚(9,9-二己基芴)(PF6)具有抑制的链簇集行为。所有共聚物的PL主峰均位于423 nm左右,且P2的薄膜态荧光量子效率达到0.56。热退火PL光谱研究表明,共聚物的绿光发射强度随金刚烷摩尔分数的增加而降低,在200℃处理1 h后,P1、P2和P3在520 nm处的与绿光发射相关的荧光相对强度仅为0.084、0.083和0.065,均远远低于PF6的0.225。

Suzuki Coupling Polymerization and Photoluminescence Properties of Polyfluorenes Based on Adamantane Dibromide

Three kinds of polyfluorenes with relatively high molecular weights based on adamantane modified comonomers were synthesized by the Suzuki coupling polymerization.The yields of polymerization were more than 90% and the thermal analysis revealed that the deposition temperature of P1～3 were 412,420 and 430 ℃,respectively.UV and PL spectra showed that the adamantane modified polyfluorenes exhibited less chain aggregation in comparison with the homo-polymer poly(9,9-dihexylfluorene)(PF6).The PL emissions of the copolymers all peaked around 423 nm and the solid fluorenscence quantum effect of P2 reached 0.56.The annealing PL spectra of the polymer films revealed that the normalized intensities of green emission at 520 nm declined with the increase of the adamantane molar fraction.Under the treatment at 200 ℃ for 1 h,the normalized fluorenscence intensities related with green emission for P1～3 were 0.084,0.083 and 0.065,respectively,which were all far less than the 0.225 for PF6.