Departamento de Engenharia de Materiais, PPGEM, Universidade Federal do Rio Grande do Sul , Av. Bento Gonçalvez, 9500, Setor 4, Prédio 74 - 91501-970, Porto Alegre (Rio Grande do Sul), Brazil.
J Phys Chem B. 2014 Jan 30;118(4):1102-12. doi: 10.1021/jp409675z. Epub 2014 Jan 16.
The role of the incorporation of conducting polymer (CP), doped with different sulfonic acid organic molecules, in polystyrene (PS) and high-impact polystyrene (HIPS) with poly(styrene-ethylene-butylene) (SEBS) triblock copolymer has been investigated. Two factors associated with this model membrane system are addressed: (i) the influence of the presence of a low concentration of doped conducting polymer and (ii) the influence of the membrane preparation method. Membrane characterization and bulk conductivity measurements allowed the conclusion that proton conductivity has been promoted by the addition of CP; the best results were achieved for PAni-CSA, in either PS/SEBS or HIPS/SEBS blends. Additionally, the water uptake only decreased with the addition of PAni-doped molecules compared to the pure copolymer, without loss of ion-exchange capacity (IEC). Electrodialysis efficiency for HIPS/SEBS (before annealing) is higher than that for HIPS/SEBS (after annealing), indicating that membrane preparation method is crucial. Finally, through-plane cell arrangement proved to be an effective, quick, and time-saving tool for studying the main resistance parameters of isolating polymers, which is useful for application in industry and research laboratories working with membranes for electrodialysis or fuel cells.
已研究了将掺杂有不同磺酸有机分子的导电聚合物 (CP) 掺入聚苯乙烯 (PS) 和高抗冲聚苯乙烯 (HIPS) 与聚苯乙烯-乙烯-丁烯 (SEBS) 嵌段共聚物中的作用。该模型膜系统涉及两个因素：(i) 存在低浓度掺杂导电聚合物的影响，以及 (ii) 膜制备方法的影响。膜表征和体相电导率测量得出的结论是，质子电导率通过添加 CP 得到了促进；对于 PS/SEBS 或 HIPS/SEBS 共混物中的 PAni-CSA，获得了最佳结果。此外，与纯共聚物相比，添加 PAni 掺杂分子后仅降低了水摄取量，而没有损失离子交换容量 (IEC)。对于未经退火的 HIPS/SEBS（在退火之前）的电渗析效率高于对于 HIPS/SEBS（在退火之后）的电渗析效率，这表明膜制备方法至关重要。最后，平面内单元布置被证明是研究隔离聚合物主要电阻参数的有效、快速和节省时间的工具，这对于在电渗析或燃料电池中使用膜的工业和研究实验室很有用。
