化学氧化法制备聚吡咯及其掺杂改性研究

Preparation of polypyrrole via chemical oxidation and its doping modification

采用化学氧化法制备聚吡咯(PPy),研究了氧化剂种类[FeCl_(3)和(NH_(4))_(2)S_(2)O_(8)]、反应温度(冰浴和室温)以及反应时间(6 h和12 h)对合成导电聚吡咯的影响,并对反应条件进行了优化。重点考察了不同浓度表面活性剂SDS掺杂对吡咯单体聚合的结构及形貌的影响,利用SEM、FT-IR、XRD、XPS、TGA、N_(2)吸附-脱附等表征方法及电导率测试对产物进行分析。结果表明,合成导电聚吡咯的最佳工艺条件为:以FeCl_(3)作氧化剂,在冰浴条件下反应6 h,产物电导率可达到0.0769 S/cm;适量掺杂剂SDS的添加改变了样品的微观形貌,有利于提高PPy的热稳定性及导电性。

Polypyrrole(PPy)is prepared through chemical oxidation method.The influences of oxidants(FeCl_(3) and(NH_(4))_(2)S_(2)O_(3)),reaction temperature(ice bath temperature and room temperature)and reaction time(6 h and 12 h)on the synthesis of conductive polypyrrole are studied,and the reaction conditions are optimized.The influences of different concentrations of surfactants SDS doping on the structure and morphology of pyrrole monomer polymerization are investigated emphatically.The product samples are analyzed by means of scanning electron microscope(SEM),Fourier transform infrared spectrometer(FT⁃IR),X⁃ray photoelectron spectroscopy(XPS),thermogravimetric analysis(TGA),specific surface area test(BET)and conductivity test.The optimum process conditions for the synthesis of conductive polypyrrole are determined as follows:FeCl_(3) is used as oxidant,and reaction has performed in ice bath for 6 h.The conductivity of the product can reach 0.0769 S·cm^(-1).An appropriate addition of SDS changes the micro⁃morphology of the product sample,which is beneficial to improve the thermal stability and conductivity of polypyrrole.