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 H-1 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.