聚吡咯膜对汞离子富集作用的研究

文章研究了聚吡咯膜对汞离子的配位富集作用,并用循环伏安法加以证实。在0.1～10mg·L-1的汞离子浓度范围内,汞离子浓度与还原电流成线性关系。该方法可用于废水中汞离子含量的检测。     

十二烷基苯磺酸钠掺杂的聚吡咯的电化学和现场拉曼光谱

研究十二烷基苯磺酸根（ＤＢＳ￣－）掺杂的聚吡咯（ＰＰＹ）膜（ＰＰＹ（ＤＢＳ￣－））的循环伏安行为和现场拉曼光谱发现，作为对阴离子的ＤＢＳ￣－可分为两类，一类ＤＢＳ￣－类似于小阴离子，即随ＰＰＹ的氧化还原在膜中自由地嵌脱；另一类ＤＢＳ￣－则始终滞留于ＰＰＹ（ＤＢＳ￣－）膜内，因此当ＰＰＹ还原时，膜内多余的负电荷则由溶液中的Ｎａ￣＋和Ｈ￣＋嵌入膜中来补偿。另外，嵌入膜中的Ｈ￣＋使ＰＰＹ发生了一定程度的质子化。     

Polypyrrole-coated styrene-butyl acrylate copolymer composite particles with tunable conductivity

A series of near or monodisperse styrene-butyl acrylate (SBA) copolymer latex particles with different butyl acrylate contents were coated with polypyrrole. The structure of the SBA/PPy composites was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC) andstandard fourprobe method. The core-shell morphology of the SBA/PPy composite particles was confirmed. The result of DSC showed that TR of the composite is mainly determined by the core component. The effects of the concentration of polypyrrole, the butyl acrylate content in SBA copolymer and the nature of the counter-anion on the electrical conductivity of compression-moulded samples were studied. It was first found that the electrical conductivity of the samples can be tuned by varying the butyl acrylate content in SBA copolymer and the highest conductivity of the core-shell composite was 0.17 S. cm^-1     

Synthesis of PPy-like Nanocrystallines by Oriented Plasma Polymerization at Atmospheric Pressure

Polymeric polypyrrole-like （PPy-llke） nanocrystallines were fast synthesized through oriented plasma polymerization at atmospheric pressure and room temperature. The effects of discharge power on the nanocrystalline morphology were investigated. Larger power tends to produce longer nanocrystallines. 3 mm long nanowires were produced at the largest power in our experiment. TEM image and the sharp electronic diffraction spots in SAD suggest that the nanoparticles have a single crystal phase. The chemical structure of the nanocrystalline has been studied through FTIR, EDX etc. This novel polymerization method could have great applications in fabricating functional polymeric nanocrystallines.     

不同电位下催化电合成聚吡咯膜的电化学行为

通过循环伏安法研究了以Ｔ＿ｓＯＨ（对甲苯磺酸），ＨＣｌ＿４，Ｈ＿２ＳＯ＿４，ＮａＣｌＯ＿４和Ｎａ＿２ＳＯ＿４为支持电解质，Ｔｉｒｏｎ为催化剂，在不同电位范围催化电合成聚吡咯（ＰＰＥ／Ｐｔ）和该膜电极在相应支持电解质水溶液中的电化学行为．发现ＰＰＥ／Ｐｔ的ＣＶ图、稳定性和电活性随聚合电位及阴离子种类的变化明显不同于非催化电合成聚吡咯．在０～０．８Ｖ电位范围制得的ＰＰＥ／Ｐｔ的稳定性最好，并随支持电解质的变化按Ｔ＿ｓＯＨ，ＨＣｌＯ＿４，Ｈ＿２ＳＯ＿４，ＮａＣｌＯ＿４和Ｎａ＿２ＳＯ＿４的顺序减小．同时讨论了产生变化的原因．     

聚苯胺(PAn)和聚吡咯(PPy)膜电极对Hg(Ⅰ),Sn(Ⅱ)氧化的电催化行为

聚苯胺(PAn)和聚吡咯(PPy)膜电极对Hg(Ⅰ),Sn(Ⅱ)的氧化的电催化作用以循环伏安法(CV)进行了研究.在0.3mol·dm~(-3)HNO_3中PAn膜电极对Hg(Ⅰ)的氧化在0.445V处有一个非常尖的氧化峰,其峰电流I_(pa)的值为同样条件下Hg(Ⅰ)在光滑裸铂电极上峰电流值的5倍以上.PPy膜电极对Hg(Ⅰ)的电催化氧化有相似的结果,在0.49V处有一个尖峰,这是Hg(Ⅰ)在PPy上的氧化峰,I_(pa)值为在裸铂电极上的数倍.这些结果都说明PAn和PPy对Hg(Ⅰ)的氧化有明显的电催化作用.与此相似,PAn,PPy膜对Sn(Ⅱ)的氧化有类似的效果.PAn与PPy对Hg(Ⅰ)和Sn(Ⅱ)的氧化,其峰电流I_(pa)与扫描速率v的平方根成直线关系,这说明Hg_2~(2+)和Sn~(2+)离子在这两种导电聚合物膜电极上的电极过程受膜内扩散控制.     

THE STUDY ON CHLORINATED POLYPROPYLENE (PPCI)-POLYPYRROLE (PPy) COMPOSITE FILM

The chlorinated polypropylene-polypyrrole composite film was synthesized by means of a newmethod for the first time. The effects of various conditions on polymerization and the electric con-ductivity of PPCl-PPy composite film were investigated. It was found that PPCl-FeCl_3 mixturehad an excellent film-forming ability and PPCl-PPy composite film could attain high conductivityat low content of polypyrrole and was stable for heat and atmosphere.     

聚吡咯-聚苯胺同型异质结的整流特性

在电化学氧化聚合的p-型聚吡咯薄膜与化学氧化聚合的可溶性p-型聚苯胺涂层之间的接触界面处,观察到了同型异质结整流效应,整流比为30(0.8V),其伏-安特性符合电子扩散理论结果。     

化学法合成导电聚吡咯的研究现状

本文综述了近年来化学法合成导电聚吡咯的研究状况，重点介绍其在结构、导电机制及制备复合导电材料等方面的进展情况．     

Effect of feeding ratios on the structure and electrochemical performance of graphite oxide/polypyrrole nanocomposites

Graphite oxide (GO)/polypyrrole (PPy) nanocomposites (GPYs) were synthesized using in situ polymerization.The effect of the feeding ratios of pyrrole and GO on the structure and electrochemical performances of GPYs was investigated.The structure was characterized via Fourier-transform infrared spectroscopy,scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The electrochemical performance was characterized via cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The results indicate that the more pyrrole is added to GO (with GO concentrations of 20% and 50%),the more agglomeration of both PPy and GO layers occurs.This is detrimental to the capacitance utilization of PPy.When the feeding ratio of GO:pyrrole is 80:20,PPys with nanofibrils are dispersed homogenously in/on the exfoliated layer of GO and the conductivity is enhanced.The capacitance utilization of PPy in a composite with a GO concentration of 80% (383 F/g) is higher than that of pure PPy (201 F/g),which indicates the presence of a synergistic effect between GO and PPy.