加热处理对十二烷基取代聚噻吩导电性能及结构的影响  

Conductivity and Structure Study of Poly(3-dodecylthiophene)upon Heating

作　　者：王金伟[1] 庞晓露[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《合成材料老化与应用》2005年第2期8-10,56,共4页Synthetic Materials Aging and Application

摘　　要：以化学氧化法制备聚合物然后用碘进行掺杂处理使其导电,用表面电阻率、热失重分析、X射线光电子能谱研究了十二烷基取代聚噻吩在经反复加热和掺杂处理后的性能和结构变化。表面电阻率受温度的影响较大,在温度达到200℃以上时,该聚合物部分或全部丧失导电性。从X-射线光电子能谱可明显观察到空气中氧气参与了加热和掺杂过程并发生的物理化学反应。十二烷基取代聚噻吩掺杂后的热去掺杂过程在较低温度下(低于200℃)其导电性能可以恢复,但在高温下却不可恢复;而其结构经每一次热处理的破坏是不可逆转的,每一次加热处理都加速其老化降解。Poly(3-dodecylthiophene)(p3ddt)was prepared by oxidative polymerisation,doped with iodine,and characterised by surface resistivity,thermogravimetric analysis(TGA)and X-ray Photoelectron Spectroscopy(XPS),to understand its conductivity and structure change upon doping and de-doping.the surface resistivity of p3ddt was greatly affected by the thermal dedoping temperature.P3ddt would partially or completely lose conductivity above the dedoping temperature at 200℃.XPS results revealed that doping and heating was accompanied by oxidation with the participation of oxygen.Its conductivity could be recovered if the dedoping temperature was low(under 200℃);but it could not be recovered if the dedoping temperature was higher.Thermal dedoping was an irreversible process in the view of structure destruction,and the degradation process was aggravated under every heating cycle.

关 键 词：取代聚噻吩 十二烷基 导电性能 加热处理 X-射线光电子能谱 X射线光电子能谱 表面电阻率 物理化学反应 化学氧化法 热失重分析 结构变化 聚合物 掺杂 低温度 可恢复 氧气 老化 

分 类 号：TQ324.8[化学工程—合成树脂塑料工业] O647.2[理学—物理化学]