聚吡咯/聚苯乙烯混合膜/电解质溶液体系的介电谱解析——电解质种类和浓度对膜透过性的影响

Dielectric analysis for the System Composed of Polystyrene Membrane Interfused with Polypyrrole Particle and Electrolyte Solutions——Influence of Species and Concentration of the Electrolyte Solutions to the Permeability of the Membrane

测量了混入聚吡咯粒子的聚苯乙烯混合膜在不同浓度的氯化钠、氯化钾、氯化钙及氯化镁体系的介电谱,在40Hz～11MHz,发现了显著的双介电弛豫现象(Double-relaxation phenomena).基于Maxwell-Wagner理论讨论了弛豫产生的机制,将体系进行了模型化,并利用Hanai理论方法对介电谱进行了解析,从获得的内部参数对混合后的膜荷电性质以及混合膜对离子的透过性进行了详细的讨论,进而利用Donnan平衡理论推导的膜电位的表达式拟合,获得了混合膜的固定电荷等参数.

Dielectric measurements were carried out for polypyrrole （PPy）/polystyrene （PS） composite membrane immersed in different concentration of NaCl, KCl, CaCl2 and MgCl2 electrolyte solutions over a frequency range from 40 Hz to 11 MHz, two relaxations were observed. The dielectric relaxation mechanism was explained by the dielectric theories based on Maxwell-Wagner polarization relaxation, the system was modelled and the phase parameters were calculated via Hanai＇s method. From the dielectric parameters, we discussed the electric property and the selectivity to different ions in the electrolyte solutions of the membrane in detail. Futher more, we acquired parameters of the membrane such as its concentration of the fixed charge. Valuable results of the ion permeability of PPy/PS membrane were obtained.