共轭/非共轭嵌段聚苯撑乙烯(PPV)类共聚物的合成与性能

用活性中间体直接引发共轭/非共轭单体聚合的新方法合成了3种PPV嵌段共聚物;用核磁共振谱和FTIR光谱确定了共聚物的结构.引入非共轭片段PS缩短了PPV共轭链的长度,改善了聚合物的溶解性和可加工性.荧光光谱结果表明,嵌段聚合物可使发射峰蓝移,发光的量子效率明显提高,进而调节了发光颜色.

Synthesis and Properties of the Copolymers Containing Both Conjugated Block(PPV) and Nonconjugated Block(PS) Segments

Three kinks of poly( p phenylenevinylene)(PPV) copolymers with a conjugated block and nonconjugated polystyrene(PS) were synthesized by p quinomethane active intermediate. The chemical structure of the copolymers was determined and confirmed by 1H NMR and FTIR. The introduction of flexible segment PS in the PPV type of polymer leads to the interruption of conjugation, which shortens the effective conjugated length and improves their solubility and processibility for LED devices. In comparison with PPV, the copolymers containing both conjugated and noncojugated segments result in light emission of blue shifting, enhancement of luminescence efficiency and tuning color of emission light. The experiment results indicate that the polymerization of conjugated segment and noncojugated segment by p quinomethane intermediates is a new and effective synthetic route for the copolymers.