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在不同磁场强度下,采用微乳液聚合法合成导电聚苯胺(PANI),以碳纸负载PANI为工作电极,通过循环伏安测试方法,探讨了磁场、氧化剂浓度和聚合时间对微乳液聚合法合成PANI电化学性能的影响;并通过X射线衍射(XRD)、四探针电导率测试和傅立叶红外光谱(FTIR)对产物结构和性能的表征分析,印证了循环伏安分析结果的可靠性.实验结果表明,与无磁条件下制备的PANI相比,磁场条件下制备的PANI具有较高的导电性和规整度;FTIR谱图分析表明,由于磁场的取向作用使分子间相互作用力降低,分子链离域程度增大,使磁场条件下合成PANI的主要特征峰有向低频方向移动的趋势,但分子的基本结构单元没有发生变化.研究结果显示,利用负载PANI的碳纸为工作电极,能够对微乳液法合成PANI的电化学行为进行有效的实时表征.
Conductive polyaniline (PANI) was synthesized by microemulsion polymerization with PANI as the working electrode under different magnetic field intensities. The effects of magnetic field, concentration of oxidant and polymerization time on the synthesis of microemulsion polymerization were investigated by cyclic voltammetry PANI were investigated. The structure and properties of the product were characterized by X-ray diffraction (XRD), four-probe conductivity and Fourier transform infrared spectroscopy (FTIR), which confirmed the reliability of the cyclic voltammetry results. The results showed that PANI prepared under magnetic field had higher electrical conductivity and regularity than PANI prepared under non-magnetic condition. FTIR spectrum analysis showed that the interaction between molecules was decreased due to the orientation of magnetic field. The extent of the delocalization of the chains increased so that the main characteristic peaks of the synthesized PANI tended to move in the low frequency direction under the magnetic field conditions but the basic structural units of the molecules did not change.The results showed that using the PANI-loaded carbon paper as the working electrode, The electrochemical behavior of PANI synthesized by microemulsion method is effectively characterized in real time.