聚(3-丁基噻吩)电导的热稳定性

Thermal Stability of Poly(3-butylthiophene)

研究了导电聚合物聚（３－丁基噻吩）（ＰＢＴ）在大气环境下的导电热稳定性。在室温至２２０℃范围内，测试电导率随时间及温度的变化。ＴＧＡ分析以及化学分析的结果表明：掺杂态的ＰＢＴ大约在１４０℃附近有一转化温度，低于或高于这一转化温度，电导率下降的决定因素各不相同。高于转化温度时，电导率下降的主要原因是反离子和高分子主链的解离，进而发生化学反应，影响了高分子主链的结构。ＸＰＳ测试结果表明：经热处理后的ＰＢＴ薄膜的高分子主链结构发生了变化，产生了高价态的碳和高价态的硫。

The thermal stability of electrically conducting polymer poly(3 butylthiop hene) (PBT) doped with FeCl3 was studied,and the decay rate of its conductivity versus aging time and temperature was determined at various temperature in air ambient.By chemical analysis and thermogravimetric analysis (TGA),it is indicated that there is a transition around 140℃. This may be explained by the torsion of PBT below the transition temperature and the decomposition of doped PBT above the transition temperature,respectively. The X ray Photoelecton Spectroscopy (XPS) analysis suggested that doped PBT contains carbon and sulpur in valency of high value after heating above the transition temperature.