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Studies on the electrical diffusivities of mono-carboxylates through heterogeneous anion exchange membranes

机译:单羧酸盐通过异质阴离子交换膜的电扩散性研究

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Heterogeneous anion exchange membranes have been prepared by solution casting technique with poly (vinyl chloride) (PVC) as inert binder and anion exchange resin (-300 + 400 mesh) by varying their blend ratio from 60 : 40 to 30 : 70. The membranes were characterized with respect to their physical, mechanical, and electrochemical behavior. The transport behavior of such membranes was studied in the solutions of different homologous monocarboxylate salts starting from formate to butyrate. Membrane conductance values, in conjunction with the solution conductance, were used to determine the isoconductance points following the microheterogeneous model developed by Zabolotsky and Nikonenko, J Membr Sci 1993, 79, 181. Frorn the electro conductivity ((kappa) over bar) and exchange capacity ((Q) over bar) of the joint gel phase, the diffusion coefficients of different carboxylate anions have been determined. The specific conductivities of the joint gel phase decreases in the order (kappa) over bar formate > (kappa) over bar acetate > (kappa) over bar propionate > (kappa) over bar > butyrate. For any specific carboxylate counter ion, the (kappa) over bar (70) > (kappa) over bar (60) > (kappa) over bar (50) > (kappa) over bar (40) .For any particular resin loading the diffusion coefficient in membrane for formate > acetate > propionate > butyrate. The membranes Studied here (varying in their blend ratios) may be synchronized by nearly same heterogeneity factor P of value 0.38 +/- 0.04. (c) 2007 Wiley Periodicals, Iiic.
机译:通过溶液浇铸技术,以聚氯乙烯(PVC)作为惰性粘合剂和阴离子交换树脂(-300 + 400目),通过将其混合比从60:40更改为30:70来制备非均相阴离子交换膜。关于它们的物理,机械和电化学行为对其进行了表征。在从甲酸到丁酸酯的不同同源单羧酸盐溶液中研究了这种膜的运输行为。遵循Zabolotsky和Nikonenko(J Membr Sci 1993,79,181)开发的微非均质模型,使用膜电导值和溶液电导率来确定等电导点。在电导率((kappa)超过bar)上进行交换结合凝胶相的容量((Q)超过bar),已确定了不同羧酸根阴离子的扩散系数。联合凝胶相的比电导率依次为:甲酸棒>κ>醋酸乙酯>(kappa)丙酸>κ>丙酸棒>丁酸>(kappa)。对于任何特定的羧酸盐抗衡离子,在(70)上的(kappa)>在(60)上的(kappa)>在(50)上的(kappa)>在(40)上的(kappa)。甲酸>乙酸>丙酸>丁酸在膜中的扩散系数。此处研究的膜(混合比例不同)可以通过几乎相同的值0.38 +/- 0.04的异质性因子P进行同步。 (c)2007年,IIiic,Wiley期刊。

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