水溶性导电聚苯胺的制备及应用研究进展

水溶性导电聚苯胺由于其优异的电性能和化学稳定性,具有潜在的实用性价值.总结了水溶性导电聚苯胺的制备方法,重点阐述了聚苯胺衍生物和共聚态聚苯胺的制备,提出了水溶性导电聚苯胺的发展方向.     

基于水凝胶吸附聚苯胺超级电容器的制备与性能研究

本文采用不同浓度的苯胺生成聚苯胺与丙烯酰胺制备的水凝胶吸附,研究了水凝胶吸附不同浓度的苯胺,对其超级电容器器件性能的影响,结果表明基于水凝胶吸附聚苯胺的超级电容器具有良好的电化学储能性能。     

辣根过氧化物酶催化合成水溶性导电聚苯胺的研究

以辣根过氧化物酶(HRP)为催化剂、十二烷基硫酸钠(SDS)为模板研究了生物催化水溶性导电聚苯胺(PANI)的合成.探讨了反应体系的pH值、过氧化氢浓度和SDS浓度对聚合反应的影响,并研究了HRP催化苯胺聚合过程中性质的变化.紫外可见扫描光谱分析和电导率测定的结果表明,在以SDS为模板的条件下,HRP催化水溶性导电聚苯...     

硫酸亚铁-过氧化氢体系绿色合成聚苯胺的研究

以硫酸亚铁-过氧化氢为绿色催化氧化体系合成了聚苯胺。探讨了硫酸亚铁浓度、过氧化氢的用量、反应体系酸度、反应温度、苯胺浓度等工艺条件对聚苯胺收率的影响,分析了该体系中苯胺可能的聚合机理,推测并初步验证了反应液重复使用的可行性。在亚铁浓度为3.36×10-4mol/L,n(过氧化氢)∶n(苯胺)=1.4∶1.0,反应温度为70℃,H+(硫酸)浓度1.5 mol/L,单体浓度0.9 mol/L条件下,聚苯胺收率为77.2%。     

酶催化水溶性导电聚苯胺的模板导向合成与表征

对辣根过氧化物酶(HRP)催化水溶性导电聚苯胺的合成进行了研究.以聚乙烯磺酸钠(PVS)作为反应的聚阴离子模板.详细地研究了反应体系的pH值、H2O2浓度及苯胺与PVS的摩尔比对苯胺聚合的影响.用UV-vis-near-IR、FTIR及四探针电导率测试仪对产物进行了表征,并与其他模板聚合产物进行了比较.研究结果表明,PVS可作为HRP催化苯胺聚合的模板,合成的PVS/PANI的电导率为4.78×10-1S·cm-1,反应体系的pH值应控制在4.0～5.0,H2O2浓度以20 mmol·L-1为宜,PVS与苯胺的摩尔比应控制在1～1.5.     

聚苯胺/聚丙烯导电纤维的制备

采用现场吸附聚合法制备了聚苯胺/聚丙烯导电纤维,研究了盐酸浓度、氧化剂浓度、苯胺单体含量、反应温度、反应时间等反应条件对纤维上聚苯胺含量的影响,并研究了改变纤维截面形状和粗细、共混纺丝、表面等离子体处理等改性处理对纤维上聚苯胺含量的影响。     

溶胀处理煤对煤结构与煤基聚苯胺导电性影响

首次选用苯胺为溶剂对神府煤(SFC)进行溶胀处理,以研究其对煤结构与煤基聚苯胺导电性的影响,对其结构进行TG/DSC、FTIR和SEM分析,并通过溶胀SFC处理煤为聚合基体,在苯胺和引发剂条件下聚合为煤基聚苯胺,测定了其导电率。结果表明:苯胺溶胀处理破坏了煤中非共价键,降低了煤的交联缔合度,疏松了煤的孔结构,在此条件下的煤基聚苯胺的导电率均小于溶胀处理前原煤为聚合基体的煤基聚苯胺导电率,这与煤大分子网络结构受到一定程度破坏有关,这可为煤基聚苯胺的扩大化生产提供重要参考。     

水溶性聚苯胺合成及聚苯胺在防腐领域的应用

介绍了聚苯胺的结构,主要讨论了水溶性聚苯胺的3种合成方法,及聚苯胺在防腐领域的研究及发展,阐述了聚苯胺的防腐机理和聚苯胺防腐涂层的应用,并对其前景进行展望,认为水溶性聚苯胺的合成研究及其缓蚀理论分析还需进一步深入地开展研究。     

电化学合成聚苯胺的研究概况

聚苯胺是目前研究最为广泛的导电高分子材料之一.综述了电化学方法合成聚苯胺的研究概况,包括电解液的pH、苯胺单体浓度、掺杂酸的种类、聚合电位、聚合电流密度、循环伏安扫描的次数、速率以及扫描上限、扫描方式等工艺条件对聚苯胺膜的制备及其性能的影响.并对聚苯胺的研究前景进行了展望.     

有机磷酸酯掺杂聚苯胺的研究

以有机磷酸酯为掺杂剂、过硫酸铵为引发剂,采用化学氧化法合成导电聚苯胺。在苯胺浓度为0．1mol/L、有机磷酸酯浓度为0．3mol／L、过硫酸铵浓度为0．12mol/L、温度10℃、聚合反应时间3．5小时的条件下,合成了电导率达0．42s/cm的聚苯胺。采用红外光谱和X－射线衍射对其结构进行了表征。     

Synthesis of highly conducting nylon-6 composites and their electrical properties

Highly conducting nylon-6 composites are synthesized by exposing nylon-6 films or fabrics impregnated with an oxidizing agent, cupric chloride, simultaneously to aniline and hydrochloric acid vapors. The conductivity of composite films reaches up to 10^?2 S/cm and can be controlled by varying the experimental conditions for the composite synthesis. The effects of the concentration of cupric chloride, exposure time to aniline and hydrochloric acid vapors, and concentration of hydrochloric acid to the polyaniline content and the conductivity of nylon-6/polyaniline composites are analyzed by means of statistical F test. The morphology change of composite films resulting from the synthesis conditions, conductivity in relation to the morphology, and stability of conductivity to ambient air exposure have been investigated.     

Investigation of corrosion performance of epoxy coating containing polyaniline nanoparticles

An emulsion polymerization of aniline was performed in a solution of dodecylbenzenesulfonic acid emulsifier, benzoyl peroxide oxidant and tartaric acid as dopant. The polyaniline-containing coating was applied over carbon steel panels and the polyaniline content in the coating was 1?%. The influence of reactants concentration on the morphological and anti-corrosive properties of polyaniline was investigated to determine the optimum conditions for the synthesis of polyaniline nanoparticles. The average size of particles determined by X-ray diffraction measurement was 70?C104?nm, which is found to be in agreement with the scanning electron microscopy results. Corrosion resistance of coatings was obtained using electrochemical techniques (electrochemical impedance spectroscopy and open circuit potential measurements) in 3.5?% sodium chloride solution. Nyquist diagrams showed two capacitance loops, one at high frequency range followed by a larger one at low frequencies due to coating and charge transfer resistance. The corrosion resistance values were found to decrease due to the corrosion of carbon steel in pinholes of the coating. For longer immersion times, the coating resistance values were found to increase due to the passivation effect of polyaniline. The results showed that epoxy coating with doped polyaniline nanoparticles is able to offer protection in sodium chloride solution.     

Matrix synthesis of water-soluble polyaniline in the presence of polyelectrolytes

The matrix polymerization of aniline hydrochloride in the presence of polyanions with different chemical structures and molecular masses is studied. Poly(2-acrylamido-2-methyl-1-propanesulfonic acid) and poly(4-styrenesulfonic acid) or its sodium salt are used as polyelectrolyte matrices. It is shown that, if the polymerization of aniline hydrochloride is conducted in the presence of a polyelectrolyte matrix, water-soluble polyelectrolyte complexes in which polyaniline occurs in the form of an emeraldine salt are formed. The mechanism of polymerization is advanced. It is found that the sizes of polyaniline complexes in water are independent of the molecular mass of the polyelectrolyte matrix and its chemical structure.     

Corrosion of mild steel with composite polyaniline coatings using different formulations

The protective abilities of composite coatings based on electrochemically and chemically formed polyaniline powder against the corrosion of mild steel were investigated. A polyaniline powder has been prepared in the form of an emeraldine base and benzoate salt through chemical dedoping and doping. The composite coatings using polyaniline powders, which were obtained through different routes, and base coatings, which were not corrosion-resistant, with different formulations were prepared and applied on mild steel samples. The corrosion was investigated using an electrochemical impedance technique in 3% NaCl, and the atmospheric corrosion was assessed in a humidity chamber. Emeraldine–benzoate salts, which are a chemically synthesized polyaniline, offer the best protection with an optimal polyaniline concentration of approximately 5 wt%. The different corrosion behaviors were assessed relative to the presence of aniline oligomers in the samples after characterization using UV–vis spectrophotometry. Upon comparison between the corrosion behavior in 3% NaCl with commercial primer paint for iron and that with a paint containing 5 wt% PANI, the composite coating has superior anticorrosion characteristics. The mechanism for the protection of mild steel from corrosion through composite polyaniline coatings was also considered.     

Polyaniline as corrosion inhibitor for iron in acid solutions

In recent years, polymer amines have been studied as an efficient corrosion inhibitor for iron in acid media. In this article, the performance of water soluble polyaniline as corrosion inhibitor for iron in 0.5M H₂SO₄ has been evaluated by potentiodynamic polarization, linear polarization, and electrochemical impedance spectroscopy and compared with the performance of the aniline monomer. It has been found that polyaniline is an efficient inhibitor, since the maximum efficiency of 84% has been observed at a concentration of 100 ppm, whereas the monomer has accelerated the corrosion. FTIR studies have shown that the polyaniline is strongly adsorbed on the iron surface and inhibits the corrosion effectively. However, aniline has been found to improve the passivation tendency of iron at higher concentrations. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2144–2153, 2006     

聚邻甲苯胺防腐涂层对碳钢的腐蚀保护作用

离分子聚苯胺及其衍生物具有良好的电活性。本文介绍了聚邻甲苯胺的合成,并利用线性极化法和动电位扫描极化曲线拟合法研究了聚邻甲苯胺涂覆碳钢电极在０．１ｍｏｌ／Ｌ盐酸溶液中的腐蚀行为。试验发现：用聚邻甲苯胺作底漆、环氧作面漆的复合涂层大大提高了碳钢电极的检化电阻,减小了其腐蚀电流。其对碳钢的腐蚀保护作用主要是由于掺杂态聚邻甲苯胺的电活性。     

Copolymerization of poly(1‐naphthylamine) with aniline and o‐toluidine

The commercial use of polyaniline has been impeded by its intractable nature and insolubility. The use of substituted polyaniline has been attempted mainly to increase the processibility of polyaniline, but this approach usually results in the lowering of the conductivity. This study reports the synthesis of poly(1‐naphthylamine), a fused ring derivative of polyaniline, and its copolymers with aniline and o‐toluidine via a chemical polymerization method. Spectral, thermal, morphological, and conductivity studies were carried out to elucidate the influence of the incorporation of aniline and o‐toluidine units into poly(1‐naphthylamine). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008