相转移催化剂对聚吡咯界面聚合的影响

Effect of Phase Transfer Catalyst on Polypyrrole Interfacial Polymerization

采用界面化学氧化聚合法,以FeCl3为氧化剂、吡咯为单体,在相转移催化剂冠醚18C6(CE)与聚乙二醇1000(PEG)辅助下合成聚吡咯(PPy)薄膜。利用扫描电子显微镜、热重分析及电化学测试(循环伏安测试、交流阻抗测试)对其结构与性能进行了研究。结果表明,相转移催化剂的加入,促进了氧化剂向油相扩散,抑制了单体向水相扩散,聚合反应为扩散控制反应;加入相转移催化剂得到的聚吡咯薄膜结构规整;无相转移催化剂时聚吡咯薄膜的比电容为47.01F/g,添加0.04mol/L CE后其比电容提高到237.95F/g,提升4倍以上,且循环稳定。

Polypyrrole （PPy） thin films were synthesized via interracial chemical oxidation method using FeC13 as oxidant and pyrrole as monomer with the addition of phase transfer catalysts （PTC）, 18C6 crown ether （CE） and polyethylene glycol 1000 （PEG）. Scanning Electron Microscope （SEM）, Thermo-Gravimetric （TG） analysis, and electrochemical analysis （Cyclic Voltammetry （CV） and Electrochemical Impedance Spectroscopy （EIS）） were used to characterize the structure and property of PPy. Results show that addition of PTC strongly accelerates the diffusion of oxidant to oil phase, inhabits the diffusion of monomer to water phase, indicating that polymerization of PPy is a diffusion-controlled process. PPy films show ordered structure. With the addition of 0. 04 mol/L CE, the specfic capacitance of PPy films is 237.95 F/g, which is 4 times higher than PPy films（47.01 F/g） synthesized without CE, and the material is cyclic stably.