苯胺和环氧丙烷共聚物的制备及其性能

Preparation and properties of polyaniline-poly(propylene oxide)

采用循环伏安法制备了苯胺和环氧丙烷导电高分子共聚物(PAN-PPO),采用扫描电子显微镜(SEM)和差热分析等对聚合物进行表征,同时研究其对甲醇的电催化氧化作用.结果表明:在相同的条件下,PAN-PPO的聚合氧化还原峰电流和电导率均高于聚苯胺(PAN);PAN-PPO具有均匀致密的纳米纤维网状结构,纤维直径小于70 nm;PAN-PPO的热分解温度略低于聚苯胺(PAN);在甲醇酸性体系中,PAN-PPO对甲醇具有较好的电催化活性,此反应受扩散控制.

Polyaniline （PAN） is one of the most extensively studied materials and attracts great interest from electrochemical viewpoint. However, in order to obtain the most suitable material, the physical and chemical properties of the polymer have to be modified. One of the most important methods is copolymerization. In this paper, a novel copolymer of polyaniline-poly （propylene oxide） （PAN-PPO） film was prepared by cyclic voltammetry for the first time. It was characterized with SEM and thermogravimetric analysis. In addition, the electrocatalytic activity of PAN-PPO for methanol oxidation was investigated. Results showed that under the same conditions, both redox peak currents during polymerization and conductivities of PAN-PPO were higher than those of PAN; the structure of PAN-PPO was a cross linked network, composed of many uniform and dense nano fibers with diameter less than 70 nm; the degradation temperature of PAN-PPO was a little lower than that of PAN. In comparison with PAN, PAN PPO showed a high electrocatalytic activity for oxidation of methanol and the electro-oxidation reaction was controlled by the diffusion step.