当前位置: X-MOL 学术Chem. Pap. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A comparative study of the effect of organic dopant ions on the electrochemical and chemical synthesis of the conducting polymers polyaniline, poly( o -toluidine) and poly(o-methoxyaniline)
Chemical Papers ( IF 2.2 ) Pub Date : 2021-01-05 , DOI: 10.1007/s11696-020-01477-8
Hasan F. Alesary , Hani K. Ismail , Mohammed Q. Mohammed , Halgurd N. Mohammed , Zaid K. Abbas , Stephen Barton

Electroactive polymers such as polyaniline and its derivatives have many potential applications, but the nature of the dopants can have an adverse effect on their properties. Polyaniline (PANI), poly(o-methoxyaniline) (POMA) and poly(o-toluidine) (POT) have been synthesised using appropriate organic acid dopants (2-naphthalenesulfonic acid and 1,5-naphthalenedisulfonic acid) via electrochemical and chemical polymerisation methods, where the later was achieved at pH (1–2) in the presence of ammonium persulfate as an oxidant. The effects of the monomers and organic dopants on the physiochemical properties and morphological surface of the polymers were studied by means of Fourier transform infrared spectroscopy, electrical conductivity measurements, thermogravimetric analysis and scanning electron microscopy (SEM). The above films were also synthesised electrochemically whilst varying conditions such as scan rate, scan number and in aqueous solution of organic acids using cyclic voltammetry techniques. Cyclic voltammetry experiments have been employed to analyse the growth behaviour and electrochemical stability of films in the background electrolytes (monomer-free). It was found that PANI salts displayed higher doping levels and conductivity while POMA and POT salts were found to show lower conductivity and doping levels, respectively. Furthermore the electrochemical response of films was different in the stability and this may be because of the methoxy (–OCH3) and methyl (–CH3) groups located at the ortho position of the aromatic ring structure of the monomers (o-methoxyaniline and o-toluidine). The –OCH3 and–CH3 groups have significant steric effects and can reduce to form long chains of polymers and also decrease conductivity. The SEM showed that the morphologies of the prepared conducting polymers were different, which was associated with the nature and size of the dopant and monomer present in the bath solution.



中文翻译:

有机掺杂离子对导电聚合物聚苯胺,聚邻甲苯胺和聚邻甲氧基苯胺的电化学和化学合成影响的比较研究

电活性聚合物(例如聚苯胺及其衍生物)具有许多潜在应用,但掺杂剂的性质可能对其性能产生不利影响。聚苯胺(PANI),聚(邻甲氧基苯胺)(POMA)和聚(邻甲苯胺)(POT)已使用适当的有机酸掺杂剂(2-萘磺酸和1,5-萘二磺酸)通过电化学和化学聚合反应合成方法,后者是在过硫酸铵作为氧化剂的条件下在pH(1-2)下实现的。通过傅里叶变换红外光谱,电导率测量,热重分析和扫描电子显微镜(SEM)研究了单体和有机掺杂剂对聚合物的理化性质和形态表面的影响。使用循环伏安技术,还通过电化学合成上述膜,同时改变条件,例如扫描速率,扫描次数以及在有机酸的水溶液中。循环伏安法实验已用于分析背景电解质(无单体)中薄膜的生长行为和电化学稳定性。发现PANI盐显示出较高的掺杂水平和导电性,而POMA和POT盐分别显示出较低的导电性和掺杂水平。此外,薄膜的电化学响应在稳定性方面有所不同,这可能是由于甲氧基(–OCH 循环伏安法实验已用于分析背景电解质(无单体)中薄膜的生长行为和电化学稳定性。发现PANI盐显示出较高的掺杂水平和导电性,而POMA和POT盐分别显示出较低的导电性和掺杂水平。此外,薄膜的电化学响应在稳定性方面有所不同,这可能是由于甲氧基(–OCH 循环伏安法实验已用于分析背景电解质(无单体)中薄膜的生长行为和电化学稳定性。发现PANI盐显示出较高的掺杂水平和导电性,而POMA和POT盐分别显示出较低的导电性和掺杂水平。此外,薄膜的电化学响应在稳定性方面有所不同,这可能是由于甲氧基(–OCH3)和甲基(–CH 3)位于单体(邻甲氧基苯胺和邻甲苯胺)的芳香环结构的邻位。–OCH 3和–CH 3基团具有显着的空间效应,可以还原形成聚合物的长链,还可以降低电导率。SEM显示所制备的导电聚合物的形态不同,这与浴溶液中存在的掺杂剂和单体的性质和大小有关。

更新日期:2021-01-05
down
wechat
bug