聚吡咯结构与导电性能的研究

于波; 徐学诚

聚吡咯结构与导电性能的研究

于波,
徐学诚

1.
华东师范大学物理系,上海 200241

详细信息

中图分类号: O631.1+1
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出版历程
- 收稿日期: 2013-09-01
- 修回日期: 2013-12-01
- 刊出日期: 2014-07-25

Structure-conductive property relationship of polypyrrole

YU Bo,
XU Xue-cheng

1.
Department of Physics, East China Normal University, Shanghai 200241, China

摘要

摘要: 利用化学氧化法制备导电聚吡咯，通过改变制备温度得到了不同的样品.用固体13C NMR谱、FTIR光谱、Raman光谱、XRD和XPS等手段进行分析.结果表明聚吡咯的电导率随着制备温度的升高而逐渐降低，说明不同温度下制备的聚吡咯内部结构存在差异.当制备温度较低时，生成的聚吡咯主要结构是以-方式连接的线性分子链，这种连接方式使得高分子同时趋向于形成平面化的构型和构象，保证了高分子具有较高的规整度、共轭度和电导率.随着制备温度的升高，分子链中-连接方式的比例逐渐降低，分子的结构遭破坏，有序度降低，趋向于生成构象相对扭曲、缠结的空间稳定态，最终导致了分子共轭链长变短，材料的导电性能降低.
- 聚吡咯 /
- 导电聚合物 /
- 结构与温度 /
- α-α连接 /
- 共轭链长度
Abstract: Polypyrrole was synthesized by oxidative chemical polymerization. Samples presenting different conductivities were obtained by adjusting the preparing temperature. The polypyrrole samples have been investigated by means of four probe method, Solid state 13C NMR spectrum, XRD, FTIR spectroscopy, Raman spectrum and XPS, respectively. The experimental result suggested the fact that the conductivity of polypyrrole samples gradually decreases as the preparation temperature increases. The analysis indicates it is because the changing of internal structure follows the varying of external preparation conditions. The commonly structure of polypyrrole is a linear chain of monomers bonded by - carbons at a low preparation temperature. Through such a structure polypyrrole can form both a relatively planar configuration and a relatively planar conformation. This sort of structure provides the sample with a preferable regularity, a longer conjugated chain length and a higher conductivity. However, the ratio of - linkage drops as the preparation temperature increases, by which the structure of molecular is damaged, the degree of order declines. The carrier mobility of polypyrrole, as well as the conductive property, became lower.
- polypyrrole /
- conducting polymer /
- structure and temperature /
- α-α linkage /
- conjugated chain length

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