复合酸掺杂导电聚苯胺的合成及性能

Synthesis and Properties of Conducting Polyaniline Doped with Multiple Sulfonic Acid

采用复合酸掺杂微乳液法合成导电聚苯胺。探讨了反应温度和掺杂剂质量比对聚苯胺性能的影响,并通过四探针、塔菲尔曲线、激光粒度分析、热重分析以及红外光谱测试技术,对聚苯胺进行了研究与表征。结果表明,当聚合温度为15℃、磺基水杨酸和十二烷基苯磺酸钠的质量比为2.5:1时,掺杂态聚苯胺电导率和溶解度达到最大值,同时具有良好的防腐蚀能力;其中电导率可达11S/cm,在氮甲基吡咯烷酮(NMP)中溶解度可达85%;经电化学工作站测试的塔菲尔曲线可知,其腐蚀电位为-0.391V。热重分析表明,复合酸掺杂聚苯胺热分解温度约为440℃;粒径分析表明,约有90%的聚苯胺颗粒集中在50～100nm之间。红外光谱表明,复合酸掺杂聚苯胺各主要吸收峰均向低频方向移动,说明掺杂的有效性。

A conducting polyaniline doped with multiple sulfonic acid was prepared by microemuslion polymerization. Effects of reaction temperature and doping agent loading on the properties of the PAn were discussed. The properties of the PAn were studied and characterized by four-probe, Tafer curve, laser granularity analysis, thermogravimetric analysis （TGA） and FT-IR. The results show that when polymerization temperature was 15 ℃ and the mass ratio of sulfosalicylic acid （ SSA ） to sodium dodecylbenzenesulfonate （SDBS） was 2. 5： 1, both the conductivity and the solubility reached maximum, which was 11 S/cm, and 85% （in NMP）, respectively. The corrosion potential was -0. 391 V. The thermal decomposition temperature was about 440℃, and about 90% of the PAn particles were between 50 ～ 100 nm.