羟基乙叉二磷酸掺杂聚苯胺的制备、性能及表征

Preparation,characterization and properties of HEDP-PANI

以苯胺为单体,羟基乙叉二磷酸(HEDP)为掺杂剂,过硫酸铵为氧化剂,通过化学氧化聚合法合成本征态和掺杂态聚苯胺,研究了原料配比、反应温度和反应时间等因素对羟基乙叉二磷酸掺杂聚苯胺(HEDP-PANI)电阻率和产量的影响。探讨了HEDP-PANI热处理温度对其电阻率的影响。运用红外光谱和透射电镜测试技术,研究了HEDP-PAN的分子结构和聚集态结构。结果表明,制备HEDP-PANI的最佳工艺条件为:过硫酸铵、HEDP和苯胺的摩尔比为1∶1.4∶1,反应时间2 h,反应温度5℃,所得HEDP-PANI的电阻率约50.11Ω·cm,但其电阻率随热处理温度的升高逐渐增大,且在150℃后呈快速增加。HEDP-PANI分子中苯胺单体以头尾形式相连,质子化反应发生在醌环结构单元的亚氨基氮原子上,大分子间通过分子间作用力结合形成不规则的、较致密的块状结构。

The undoped and doped polyaniline were prepared by chemical oxidative polymerization method,using aniline as the reactive monomer,HEDP as the dopant and ammonium peroxydisulfate as the oxidant. The effects of the ratio of raw materials,reaction temperature and reaction time on the resistivity and yield of HEDP-PANI were studied. The effect of heat treatment temperature on the resistivity of HEDPPANI was discussed. The molecular structure and aggregation structure of HEDP-PANI were measured by infrared spectroscopy and transmission electron microscopy（ TEM）. The optimum technological conditions for the preparation of HEDP-PANI are that the molar ratio of ammonium sulfate,HEDP and aniline is 1∶1. 4∶ 1,the reaction time is 2 h and the reaction temperature is 5 ℃. Under this condition,the resistivity of HEDP-PANI is about 50. 11 Ω·cm. However,its increases with the increase of heat treatment temperature gradually,and increases rapidly over 150 ℃. In the molecule of HEDP-PANI,the aniline monomer is connected to the head and tail,the protonated reaction occurs on the amino nitrogen atom of the ring structure unit,and large molecules were formed by the intermolecular forces and its combined the irregular and dense block structures.