We analyzed the structure of buried interface of BBDMS PPV/ITO system using a high resolution ADXPS technique. A transitional layer structure, whose chemical composition, state and valence band changed gradually from ...We analyzed the structure of buried interface of BBDMS PPV/ITO system using a high resolution ADXPS technique. A transitional layer structure, whose chemical composition, state and valence band changed gradually from BBDMS PPV surface of film to substrate ITO, was observed. It was found that O 2- ion from ITO diffused into polymer film, interacted with back bone carbon and formed the carbonyl bonding which could possibly constructed the channel of the carrier on the heterointerface. Indium of ITO also diffused into BBDMS PPV layer and In(OH) 3 was formed during diffusion. The diffusion and reaction between PPV/ITO interface may affect the performance of PLED significantly.展开更多
The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatograph...The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatography(GPC), and light scattering .However, these methods are time-consuming and can not provide absolute molecular weight .MALDI/TOF has the ability to directly measure absolute molecular weight of polymer and molecular weight distribution. Besides average molecular weight, MALDI-TOF can provide information about the repeat unit and end group of the polymer. We analyzed several synthetic polymers by MALDI/TOF .Their average molecular weights were calculated and their molecular structures were proposed.展开更多
文摘We analyzed the structure of buried interface of BBDMS PPV/ITO system using a high resolution ADXPS technique. A transitional layer structure, whose chemical composition, state and valence band changed gradually from BBDMS PPV surface of film to substrate ITO, was observed. It was found that O 2- ion from ITO diffused into polymer film, interacted with back bone carbon and formed the carbonyl bonding which could possibly constructed the channel of the carrier on the heterointerface. Indium of ITO also diffused into BBDMS PPV layer and In(OH) 3 was formed during diffusion. The diffusion and reaction between PPV/ITO interface may affect the performance of PLED significantly.
文摘The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatography(GPC), and light scattering .However, these methods are time-consuming and can not provide absolute molecular weight .MALDI/TOF has the ability to directly measure absolute molecular weight of polymer and molecular weight distribution. Besides average molecular weight, MALDI-TOF can provide information about the repeat unit and end group of the polymer. We analyzed several synthetic polymers by MALDI/TOF .Their average molecular weights were calculated and their molecular structures were proposed.
