N-乙烯咔唑的电聚合

Oxidatiive Electropolymerization of N-Vmylcarbazole

在含乙烯咔唑和高氯酸钠的乙腈中用循环伏安法在Pt电极上聚合N-乙烯咔唑(PVCz)膜。循环伏安、交流阻抗和红外实验结果表明:1)聚合上限电位高,有利于PVCz 的3,3’交联;也增强PVCz 的氧化态与嵌入的ClO_4^-离子间的相互作用。使ClO_4^-离子的嵌脱过程变得比较不可逆。2)单体溶液含水量高,阻化电聚合;也使聚合膜引入H_2O,H_2O 促进PVCz的氧化态与嵌入的ClO_4^-离子相互作用,并产生空间阻碍,使ClO_4^-离子脱嵌困难,PVCz 的3,3’交联受阻。

Poly-N-vinylcarbazole(PVCz) films which arc adherent to Pt surfaces have been obtained by the electrochemical oxidation of N-vinylcarbazole(VCz) in different hydrated acetonitrile with the supporting electrolyte of NaClO4 using cyclic voltammetry. The influences of the electrode potential and the degree of hydration in the acetonitrile on electropolymerization of VCz, the structure and the properties of PVC, films have been invastigated by voltammetry, a. c. impedance technique and IR spectroscopy. The results showed that: 1) when the upper limiting potential for the polymerization exceeds the potential of the oxidativc peak A (about 1. 8 V vs. SCE), the coupling at the carbon-3 positions of carbazyl nuclei of PVCz is accelerated and the deintercalation of the ClO4- ions becomes more difficult due to the interaction between the oxidation states of PVCz and the intercalating ClO4- ions. 2) In a highly hydrated medium ,the electropolymerization is inhibited and the PVCz film contains H2O, which probably is responsible for more difficult deintercalation of the intercalating C4O4-ions and inhibition of the 3,3' coupling of PVCz.