Tan Sophie, Bélanger Daniel
Département de Chimie, Université du Québec à Montréal, Case Postale 8888, succursale Centre-Ville, Montréal, Québec, Canada H3C 3P8.
J Phys Chem B. 2005 Dec 15;109(49):23480-90. doi: 10.1021/jp054724e.
Nafion membranes were modified by chemical polymerization of aniline using ammonium peroxodisulfate as the oxidant. The Nafion-polyaniline composite membranes were extensively characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), infrared (FTIR-ATR) and X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and ion-exchange capacity measurements. The transport properties were also evaluated by conductivity and electrodialysis measurements. The data show that when a high oxidant concentration (1 M (NH4)2S2O8) is used, polyaniline is mostly formed at the surface of the Nafion membrane with a higher proportion of oligomers. On the contrary, when 0.1 M oxidant is used, polyaniline is mostly formed inside the ionic domains of Nafion, blocking the pathway to ion transport and thus reducing the transport of Zn2+ as well as the transport of H+. These data were also compared to the data obtained with poly(styrene sulfonate)-PANI composite membranes.
使用过二硫酸铵作为氧化剂通过苯胺的化学聚合对Nafion膜进行改性。使用扫描电子显微镜（SEM）、原子力显微镜（AFM）、红外（FTIR-ATR）和X射线光电子能谱（XPS）、热重分析（TGA）、差示扫描量热法（DSC）以及离子交换容量测量对Nafion-聚苯胺复合膜进行了广泛表征。还通过电导率和电渗析测量评估了传输性能。数据表明，当使用高浓度氧化剂（1 M (NH4)2S2O8）时，聚苯胺大多在Nafion膜表面形成，低聚物比例较高。相反，当使用0.1 M氧化剂时，聚苯胺大多在Nafion的离子域内形成，阻断了离子传输途径，从而减少了Zn2+以及H+的传输。这些数据还与聚（苯乙烯磺酸盐）-聚苯胺复合膜获得的数据进行了比较。
