Guo Xiaoxia, Zhai Fengxia, Fang Jianhua, Laguna Maria Fe, López-Gonzalez Mar, Riande Evaristo
Department of Polymer Science and Engineering, Shanghai Jiao Tong University, China.
J Phys Chem B. 2007 Dec 13;111(49):13694-702. doi: 10.1021/jp0734631. Epub 2007 Nov 15.
A series of sulfonated diamines were synthesized which were further used to obtain relevant sulfonated naphthalenic copolyimides. Tough and ductile membranes were cast from solutions of the copolyimides in dimethylsulfoxide, which exhibit high ion-exchange capacity and high water uptake. The protonic conductivity of the membranes equilibrated with water lies in the range 1.0-8.6 S/m, at 25 degrees C, being of the same order of magnitude as that reported for perfluorinated acidic membranes. The values of the transport number of protons and sodium ions are close to the unit for very dilute electrolyte solutions, but they lie in the range 0.80-0.90 for moderate concentrations. The membranes exhibit rather high electroosmotic permeability. The similarity of the diffusion coefficients of protons and water in the membranes suggests that the Grottus mechanism governs the protonic conductive process in the acidic membranes equilibrated with water.
合成了一系列磺化二胺，并进一步用于制备相关的磺化萘基共聚酰亚胺。通过将共聚酰亚胺溶解在二甲基亚砜中浇铸得到坚韧且有韧性的膜，这些膜具有高离子交换容量和高吸水率。在25℃下，与水达到平衡的膜的质子传导率在1.0 - 8.6 S/m范围内，与报道的全氟酸性膜处于同一数量级。对于非常稀的电解质溶液，质子和钠离子的迁移数接近单位值，但对于中等浓度，它们在0.80 - 0.90范围内。这些膜表现出相当高的电渗渗透率。膜中质子和水的扩散系数相似，这表明在与水达到平衡的酸性膜中，质子传导过程遵循Grottus机制。
