聚吡咯导电涂层的制备及其性能研究

Preparation and properties of polypyrrole conductive coatings

以十二烷基苯磺酸(BADS)为掺杂剂,过硫酸铵(APS)为氧化剂,化学法合成聚吡咯(PPy);并与羟基丙烯酸树脂配制成PPy导电涂层。用四探针测试仪测定不同反应条件下的PPy电导率,分析不同因素对PPy导电性的影响;运用扫描电镜(SEM)、激光粒度仪、电阻测试仪、紫外老化机、热分析仪、电化学工作站等对涂层进行表征。结果表明:PPy颗粒平均粒径约为1μm,且在涂层中分布均匀;20%PPy导电涂层的导电性最好,达到2.5×10^-4 S/cm;涂层经紫外加速老化720 h,导电性和附着力有所下降;涂层热稳定性较好,最终失重温度为500℃左右;PPy导电涂层的防腐蚀性优于纯树脂,5%PPy导电涂层的防腐蚀性最佳。

Polypyrrole(PPy)was synthesized by chemical synthesis using dodecylbenzenesulfonic acid(BADS)as dopant and ammonium persulfate(APS)as oxidant.The conductivity of PPy under different experimental conditions was tested by four probes.The influence of different factors on the conductivity of PPy was analyzed,and a PPy conductive coating was prepared with the aid of hydroxy acrylic resin.The coating was characterized by scanning electron microscopy(SEM),resistance tester,ultraviolet aging machine,thermal analyzer and electrochemical workstation.The results show that the PPy particles with particle size of about 2μm was evenly distributed on the coating.The conductivity of 20%PPy conductive coating was the best,reaching 2.5×10^-4 S/cm.It was found that,after placed in the UV aging machine for 30 d,the conductivity and adhesion of the coating decreased.The thermal stability of the coating was good,and the final weight loss temperature was about 500℃.The corrosion resistance of the coating was superior to that of the resin,and the corrosion resistance of the 5%PPy conductive coating was optimal.