Tan Sophie, Tieu Jacqueline H, 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 Jul 28;109(29):14085-92. doi: 10.1021/jp051278m.
Poly(styrene sulfonic acid) membranes (Neosepta CMX, Tokuyama Corp.) have been modified by in situ polymerization of aniline. (NH4)2S2O8, FeCl3, H2O2, and KIO3 were used as oxidizing agents, and two different modification methods (single-step versus two-step) were studied. The composite membranes were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, elemental analysis, electrodialysis, ion-exchange capacity, and conductivity measurements. Our results demonstrate that it is possible to control the polymerization site of aniline which in turn affects the membrane selectivity properties. Hence, composite membranes having a very thin and homogeneous surface polyaniline layer lead to a very low transport of Zn 2+ without increasing significantly the resistance to H+ conductivity. On the other hand, membranes containing about the same quantity of PANI but inside the membrane do not block the transport of Zn 2+.
聚苯乙烯磺酸膜（Neosepta CMX，德山株式会社）已通过苯胺的原位聚合进行了改性。使用（NH4）2S2O8、FeCl3、H2O2和KIO3作为氧化剂，并研究了两种不同的改性方法（一步法与两步法）。通过扫描电子显微镜、X射线光电子能谱、元素分析、电渗析、离子交换容量和电导率测量对复合膜进行了表征。我们的结果表明，可以控制苯胺的聚合位点，这反过来又会影响膜的选择性性能。因此，具有非常薄且均匀的表面聚苯胺层的复合膜导致Zn 2+的传输非常低，而不会显著增加对H+传导的阻力。另一方面，膜内含有大致相同数量聚苯胺的膜不会阻碍Zn 2+的传输。
