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首页> 外文期刊>Polymer international >Morphology transition control of polyaniline from nanotubes to nanospheres in a soft template method
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Morphology transition control of polyaniline from nanotubes to nanospheres in a soft template method

机译：软模板法控制聚苯胺从纳米管到纳米球的形态学转变控制

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A soft template route is reported for the fabrication of polyaniline nanospheres via the oxidative polymerization of aniline in the presence of β-naphthalenesulfonic acid (β-NSA) as both surfactant and dopant, and ammonium persulfate as oxidant at 2-5 °C. Control over the morphology and size of the nanoparticles was achieved by changing the reaction medium via addition of an organic cosolvent (i.e. ethanol or ethylene glycol) and by controlling the concentrations of aniline and β-NSA and the molar ratio of β-NSA to aniline. By this means the size of the β-NSA-aniline micelles and the way that aniline monomer interacts with the micelles were controlled. In fact the lower dielectric constant of organic cosolvent, due to reduction of the possibility of dissociation of ionic species, causes the monomer to exist mostly as neutral aniline molecules rather than as anilinium cations. The neutral aniline molecules form aniline-filled micelles with β-NSA, which act as soft templates for the formation of polyaniline nanospheres. Scanning and transmission electron microscopies, dynamic light scattering, and Fourier transform infrared and UV-visible spectroscopies were used to characterize the products. The mechanism of morphology transition from nanotubes to nanoparticles is discussed based on the experimental observations.
机译：据报道，在表面活性剂和掺杂剂均为β-萘磺酸（β-NSA），在2-5°C下以过硫酸铵为氧化剂的情况下，通过苯胺的氧化聚合反应，可以制备聚苯胺纳米球的软模板路线。通过添加有机助溶剂（即乙醇或乙二醇）来改变反应介质，并控制苯胺和β-NSA的浓度以及β-NSA与苯胺的摩尔比，从而控制纳米颗粒的形貌和尺寸。 。通过这种方法，可以控制β-NSA-苯胺胶束的大小以及苯胺单体与胶束相互作用的方式。实际上，由于降低了离子物种解离的可能性，有机助溶剂的介电常数较低，导致单体主要以中性苯胺分子而不是苯胺阳离子的形式存在。中性苯胺分子与β-NSA形成苯胺填充胶束，充当形成聚苯胺纳米球的软模板。使用扫描和透射电子显微镜，动态光散射以及傅立叶变换红外和紫外可见光谱来表征产品。基于实验观察，讨论了从纳米管到纳米颗粒的形态转变机理。

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