变温拉曼光谱研究电化学合成聚吡咯膜  

Raman Spectroscopic Study on Electrosynthesized Polypyrrole Films During Heating and Cooling Processes

作　　者：陈凤恩[1] 张家鑫[1] 傅明笑[1] 郁鉴源[1] 石高全[1] 

机构地区：[1]清华大学化学系,北京100084

出　　处：《光散射学报》2003年第4期276-278,共3页The Journal of Light Scattering

基　　金：国家自然科学基金资助(5022311;50073012;50133010)

摘　　要：在含有四氟化硼四丁基铵的乙氰溶液中电化学氧化吡咯制得聚吡咯膜,并在-195到150℃温度范围内研究了该聚合物膜的变温拉曼光谱。在升温过程中,与氧化态相关的拉曼光谱谱带渐渐消失,这主要是由于空气中氧气和水分子的作用。在冷冻过程中,聚合物链从无规线团状态转变成棒状构象,从而增加了导电高分子的共轭链长。由于拉曼的共振效应,在冷冻过程中与氧化态链段相关的谱带得到了增强。Polypyrrole films have been electrochemically synthesized by direct oxidative polymerization of pyrrole in acetonitrile containing tetrabutylammonium tetrafluoroborate as supporting electrolyte. We characterized the as-grown polypyrrole films by resonance Raman spectroscopy in the temperature scale of -195 to 150 ℃. During the heating process, The Raman bands related to the oxidized species decreased gradually, mainly due to the effects of oxygen and moisture in air. During the cooling process, polymer chains changed from disordered (coil-like) to ordered (rod-like) structures and caused the elongation of conjugated chain length. This led the enhancements of the Raman bands related to the oxidized species.

关 键 词：变温拉曼光谱 电化学法 聚吡咯膜 四氟化硼四丁基铵 冷冻过程 共轭链长 共振效应 谱带宽度 

分 类 号：O657.37[理学—分析化学]