Efficient polymer light-emitting diodes with violet blue emission based on blends of PSiF6-PPP and PSiFC6C6

Efficient polymer light-emitting diodes (PLEDs) with violet blue emission were fabricated using blends of copolymers of paraphenylene-co-silafluorene (PSiF6-PPP) and polymer of poly (9,9'-alkyl-3,6-silafluorene) (PSiFC6C6). The performances of the devices are sensitive to the blend ratio. When the mass ratio of PSiF6-PPP to PSiFC6C6 is 1 : 3, the highest external quantum efficiency is 1.96% at luminance of 105 cd.m2, its electroluminescent (EL) spectrum peaks at 398 nm and full width at half maximum is 67 nm. The improvements of the device performances were due to the energy transfer from PSiFC6C6 to PSiF6-PPP and the balanced injection of electrons and holes.     

可取代摄像镜头的纤维

<正>试想象一下:一堵墙可以盯着你看,或者一套军服可以全方位地为士兵提供有关战场的可视信号。借助于新一代具有柔韧性的半透明纤维,两种设想都有可能实     

英科学家培育出人造器官

英国伦敦大学学院纳米技术和再生医学系科学家亚历山大?塞法利安教授领导一支研究团队致力于在实验室培养人体器官。近来,塞法利安实验室培养出多种人体器官,如鼻子、耳朵、气管、动脉等。科学家认为,实验室培养人造器官将能够应用于临床实践,让器官捐献成为历史。当你在塞法利安实验室中看到这些人体器官,千万不要惊慌,这些     

Influences of Electrolytes on Soap-Free P（ST-MMA-AA） Emulsion Polymerization

1 Introduction Functional polymer microspheres are kinds of polymer particles with special structures, morphologies or functional groups~([1]), and have been gained much attention because of their specific properties and their application since 1980s. Although some researches have investigated that the latex particle size and its distribution, as well as the stability of polymerization and the resultant latex were strongly influenced by introducing electrolyte into the emulsion polymerization …     

Microporous polymer electrolyte based on PVDF-PEO

Since Wright et al. found that the complex of PEO/alkali metals salt had the ability of ionic conductivity in 1973, in-depth studies have been carried out about various polymer electrolytes, which were applied to replacing the liquid electrolytes in lithium ion battery. At present, polymer electrolytes mainly include three kinds:     

Influence of polymer addition on performance and mechanical properties of lightweight aggregate concrete

The influence of polymer addition on microstructure, performance and mechanical properties of lightweight aggregate concrete was investigated. It was found that the addition of polymer improved the performance and mechanical properties of lightweight aggregate concrete. It was ascertained that the modification of microstructural uniformity and densification with the addition of polymer is responsible for the enhancement of mechanical properties.With respect to compressive strength and bending strength, the lightweight aggregate concrete added with 13% ethylene-acetate ethylene interpolymer ( EVA ) exhibits preferred mechanical properties.     

Charge dynamic characteristics in corona-charged polytetrafluoroethylene film electrets

In this work, the charge dynamics characteristics of injection, transport and decay in porous and non-porous polytetrafluoroethylene (PTFE) film electrets were investigated by means of corona charging, isothermal and thermal stimulating surface-potential decay measurements. The results showed that the initial surface potential, whether positively or negatively charging, is much higher in non-porous PTFE than in porous PTFE. For porous film the value of initial surface potentials increases with increase of film thickness. Higher charging temperature can remarkably improve charge stability. The charge dynamics are correlated to materials microstructure according to their scanning electron micrographs. For non-porous PTFE films, polarizability change of C-F bonds is the main origin of electret charges; but for porous PTFE film a large number of bulk and interface type traps are expected because of the greater area of interface and higher crystallinity.     

高分子量PAN聚合体溶解工艺条件

用不同的溶解方法对高分子量PAN聚合体进行了溶解实验，结果表明：采用高速剪切乳化机进行溶解的方法能够显缩短溶解时间，搅拌的助溶作用也很明显．溶解温度、时间、浓度等工艺参数对溶液的性能也有影响．     

Recent Advances in the Development of Polymer-supported Phosphines

1 Introduction Recent years have seen a growing use of polymer-supported reagents by organic chemists in traditional solution-phase synthesis.Of the many reagents supported by polymers available, variations of triphenylphosphine are among the most broadly used. This is because triphenylphosphine is not only a reagent in a wide range of organic reactions~([1]), but it also serves as a ligand in many organometallic reagents~([2]).Most importantly, polymer-supported triphenylphosphine affords the…