Fundamental studies on the intermediate layer of a bipolar membrane Part III. Effect of starburst dendrimer PAMAM on water dissociation at the interface of a bipolar membrane
Fundamental studies on the intermediate layer of a bipolar membrane Part III. Effect of starburst dendrimer PAMAM on water dissociation at the interface of a bipolar membrane
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DOI：
10.1016/j.memsci.2004.05.002
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发表时间：
2004-09-01
影响因子：
9.5
通讯作者：
Pan, ZX
中科院分区：
文献类型：
--
作者：
Fu, RQ;Xu, TW;Pan, ZX
星形树枝状聚酰胺-胺（PAMAM）是一种结构规整的椭球形或球状聚合物，与常规聚合物相比，具有更多的氨基。本文研究了这些氨基在双极膜界面上对水解离的可能性。为此，通过将磺化聚（苯醚）（SPPO）在二甲基甲酰胺（DMF）中的溶液浇铸在预先浸入PAMAM水溶液中的商业阴离子交换膜上来制备双极膜。用X射线光电子能谱（XPS）证实了PAMAM在膜上的吸附，并用称重法测定了吸附量。用电化学阻抗谱（EIS）测定了双极膜的结厚度，用电流-电压曲线评价了双极膜的性能。实验结果表明，PAMAM的生成量和浓度对双极膜的性能有很大的影响。不同代次的PAMAMs存在一个过渡浓度，可以有效催化水的解离。高于或低于过渡浓度时，双极膜的性能下降。越高的一代。浓度越低。在溶液浓度一定的情况下，双极膜的性能与PAMAMs的生成量之间并不存在简单的单调递减或递增关系。这一切都可以根据PAMAMs的特性结合现有的水解离理论来解释。(C)2004 Elsevier B. V.保留所有权利。
Starburst dendrimer polyamidoamine (PAMAM) with ellipsoidal or spheroidal shape is structure-regular and has much more amino groups than conventional polymers. This paper investigates the possibility of these amino groups on water dissociation in a bipolar membrane interface. To do this, a bipolar membrane is prepared by casting the solution of sulfonated poly(phenylene oxide) (SPPO) in dimethyl formamide (DMF) on a commercial anion exchange membrane that is immersed in PAMAM aqueous solution in advance. The existence of PAMAM adsorbed on the membrane is proved by X-ray photoelectron spectroscopy (XPS), and the adsorption amount is evaluated by weighting method. The junction thickness of the prepared bipolar membrane is determined by electrochemical impedance spectroscopy (EIS), and the performance is evaluated by current-voltage curves. The experiments show that both the generation and concentration of PAMAM would strongly affect the characteristics of the bipolar membranes. There exists a transitional concentration for various generations PAMAMs to catalyze effectively the water dissociation. and above or below the transitional concentration the performance of bipolar membranes is decreasing. The higher the generation. the lower the concentration. Moreover, at a fixed solution concentration, there is not the simple relation of monotone decreasing or increasing between the performance of bipolar membranes and the generations of PAMAMs. All these can be explained according to the characteristics of PAMAMs combined with available water dissociation theory. (C) 2004 Elsevier B.V. All rights reserved.