新型芴-苯乙烯共聚物的合成及其性能

Synthesis and properties of two novel fluorene-styrene alternating copolymers

通过W ittig反应制备了两种新型的芴-苯乙烯共聚物p-PF-PPV和o-PF-PPV.单体和共聚物的结构经核磁共振氢谱、质谱、红外光谱测试技术确证.凝胶渗透色谱法测得共聚物p-PF-PPV和o-PF-PPV的数均分子量分别为3130,3050.p-PF-PPV和o-PF-PPV在二甲亚砜溶液中的荧光波长分别为514 nm和503 nm,固体p-PF-PPV和o-PF-PPV的荧光发射峰分别为516 nm和496 nm.两种聚合物均没有观察到玻璃化转化温度,p-PF-PPV和o-PF-PPV的热分解温度分别为330℃和579℃,有良好的热稳定性和成膜性.由循环伏安法测得的电化学性质表明:两种聚合物的HOMO能级均高于文献报道的芴-苯共聚物(PPF),具有良好的空穴传输特性.

Two novel 9,9＇ -dibutylfluorene-styrene alternating copolymers, p - PF - PPV and o - PF - PPV were synthesized by Wittig reaction . The structures of the monomers and the copolymers were verified by means of 1H nmR, MS, and FTIR. The molecular weight of the polymer was determined by gel permeation chromatography（GPC） analysis against polystyrene standards and the number-average molecular weight （Mn） of the two polymers were determined as 3130 and 3050, respectively, p -PF- PPV and o- PF- PPV in DMSO solution exhibits emission peaks at 514,503 nm respectively. In solid state, p -PF- PPV and o- PF - PPV exhibited emission peaks at 516 nm and 496 mn respectively. No glass transition temperature was observed. The copolymers possessed satisfactory thermal stability with thermal decomposition temperature（Td ） around 330℃ and 579℃, respectively. Cyclic voltammetries（CV） indicated that the HOMO levels of the copolymers were higher than those of the PPF copolymer, suggesting the better hole transport property in the copolymers.