Poly(N-methylpyrrole) electrodeposited on copper: Corrosion protection properties

Electrochemical synthesis of poly(N-methylpyrrole) films on copper electrodes from an aqueous oxalic acid has been achieved. A potential higher than 2 V (SCE) was needed to generate the polymer, for this reason, the polymer was in the overoxidized state. The inhibiting corrosion properties of this coating on copper were investigated for the first time in aqueous 0.1 M sodium chloride solution using potentiodynamic polarization, Tafel analyses, open-circuit potential and electrochemical impedance spectroscopy. Corrosion protection properties comparable to those of polypyrrole (PPy) films were observed for these films. A physical barrier effect is the most likely protection mechanism.     

Large-area photovoltaics based on low band gap copolymers of thiophene and benzothiadiazole or benzo-bis(thiadiazole)

Large-area solar cells (active area=3 and 10 cm²) were prepared with low band gap polymers based on thiophene and benzothiadiazole (1) or thiophene and benzo-bis(thiadiazole) (2). The band gaps of the polymers were 1.65 and 0.67 eV, respectively. The best photovoltaic performance was obtained for the device ITO/PEDOT/1:PCBM (1:2)/Al with an active area of 3 cm². The efficiency of the device was 0.62%. This is a high efficiency for a low band gap polymer in a large-area organic solar cell and thus polymer 1 is a very promising material for organic solar cells. The devices based on 2 were found to give poor devices when employed in bulk heterojunctions with PCBM. This was linked to a poor alignment of the energy levels in 2 with that of the electrodes and PCBM, showing that the requirement for a control of the positions of the energy levels becomes increasingly important as the band gap decreases.     

反应性高聚物对聚合物共混体系的增容作用

简要介绍了聚合物共混相容性的基本原理,讨论了增容反应的特点与类型,着重论述了反应性高聚物的制备技术、研究现状及其对聚合物共混体系的增容作用效果。     

高取代度阳离子淀粉改性棉纤维用于活性染料无盐染色的研究

本文以取代度为0.6的高取代度季铵型阳离子淀粉为阳离子化试剂,对棉纤维进行阳离子化改性,用于活性染料无盐染色.通过改性棉纤维表面Zeta电位变化和染料等温吸附曲线对无盐染色促染机理进行研究,对有盐染色和无盐染色中的染料色光、色牢度和染色纤维折皱回复性和强度性能进行比较,从而对高取代度季铵型阳离子淀粉的应用性能进行综合评...     

有机絮凝剂聚环氧氯丙烷胺的脱色性能研究

以环氧氯丙烷和二甲胺为原料,加入交联剂合成了一系列有机絮凝剂。研究了这一系列絮凝剂对活性染料废水和分散染料废水的脱色效果。考察了交联剂种类、絮凝剂黏度、阳离子度及交联剂的加入量等因素对脱色效果的影响,探讨了其脱色机理。实验结果表明,交联剂的加入改变了聚合物的结构使其更容易脱色。一般来说,聚合物黏度越高,阳离子度越大,脱色效果越好。对于活性染料废水,分子质量和阳离子度都是关键因素;对于分散染料废水,最主要的影响因素是分子质量。     

氯磺化聚乙烯橡胶在S-NPK副产盐酸储存中的应用

针对生产S-NPK复合肥副产盐酸中含有长链饱和脂肪烃^#2油,致使储罐壁丁基橡胶内衬溶胀,损坏,通过挂片试验提出底层衬δ=2mm的自硫化丁基橡胶,面层衬δ=3mm的自硫化氯磺化聚乙烯橡胶,取得了较好的效果。     

水溶性疏水缔合聚合物单体的合成

水溶性疏水缔合聚合物含有大量的亲水基团和少量的疏水基团,疏水基团间的疏水缔合作用使这种聚合物具有独特的增粘、抗剪切、耐温和耐盐的溶液性能,通常采用亲水单体和疏水单体共聚制备这类聚合物。对常用亲水单体AMPS及各类疏水单体如季铵盐不饱和单体AMPDAC和DAMAB、长链丙烯酸酯,N-烷基丙烯酰胺和N-芳烷基丙烯酰胺的合成进行了综述。     

芳杂环聚合物质子交换膜的制备

引言直接甲醇燃料电池(direct methanol fuel cell,DMFC)由于无需将甲醇转变为氢气,直接使用液体燃料甲醇,与氢氧燃料电池相比,省去许多辅助设备,体积小,成为了便携式电源的最佳候选者,特别适合用于可移动电源,如移动电话、笔记本电脑和照相机等。质子交换膜是直接甲醇燃料电池的核心组成之一,其性能好坏直接影响电池的性能和     

Perfluoroalkyl‐terminated star polymer electrolyte

A perfluoroalkyl‐terminated multiarm star polymer (perfluoroalkyl‐terminated hyperbranched polyglycerol) was synthesized and characterized on the basis of perfluorooctanoyl chloride grafting on hyperbranched polyglycerol. The conductivity of a blend of the perfluoroalkyl‐terminated star polymer and linear poly(ether urethane) was studied. The results indicated that this blend had better solvating capability in salt and higher ionic conductivity. The conductivity of the blend was 2.5 × 10^?4 S cm^?1 at 60°C when the concentration of the perfluoroalkyl‐terminated hyperbranched polyglycerol was 30 wt % and the ethylene oxide (EO)/Li ratio was 4 in the blend. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 238–242, 2005     

Effect of adhesive‐coated glass fiber in natural rubber (NR), acrylonitrile rubber (NBR), and ethylene–propylene–diene rubber (EPDM) formulations. I. Effect of adhesive‐coated glass fiber on the curing and tensile properties of NR,NBR, and EPDM formulations

Adhesive‐coated glass fibers (3 and 6 mm in length) were added at loadings of 10, 20, and 30 phr in natural rubber (NR), nitrile rubber (NBR), and ethylene–propylene–diene comonomer (EPDM) formulations in both plain and carbon black mixes. The compounds were mixed in a two‐roll mill and were characterized for their cure properties, tensile, tear, and Mullin's effect. In NR mixes, all of the formulations showed reversion in cure behavior, suggesting that NR remained unaffected. In NBR and EPDM mixes, almost all of the mechanical properties of the fiber improved. The result was more significant in EPDM than in NBR. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1111–1123, 2004