离子交换膜面电阻的测定及其影响因素

Measurement of Area Resistance of Ion-exchange Membrane and Its Influential Factors

采用自行设计的交流电法测定装置及优化的测定条件对几种离子交换膜的面电阻(Ra)进行了测定,并考察了其影响因素.结果表明,优化的测定条件为电导池电极间距10mm、极室直径20mm,测定电压频率为100.0kHz、电压为100mV.JAM和JCM系列膜的Ra与含水量呈负相关,阴膜RXAM和阳膜RXCM的Ra受溶液中反离子种类影响较大,受同离子影响较小,而双极膜RXBM的Ra则同时受溶液中阴离子和阳离子种类的影响;当溶液浓度低于0.5mol/L时,Ra随溶液浓度升高而明显降低,高于1.0mol/L以上时较稳定.

Area resistance（Ra） of several kinds of ion-exchange membrane（IEM） is determined using alternating current method by self-designed device and optimized measuring conditions.Influential factors of Ra value are also studied.The distance between the electrodes of conductivity cell is 10 mm and the chamber diameter 20 mm.The frequency of alternating current is 100.0 kHz and voltage 100 mV.For the membranes of JAM and JCM series,Ra shows negative correlation with water content.Ra of anion membrane RXAM-1003 and cation membrane RXCM-1003 varies greatly for different counter ions,while it changes slightly for common ions.However,Ra of bipolar membrane RXBM-1003 is affected by both counter ions and common ions.Ra declines significantly as solution concentration increases when the concentration is below 0.5 mol/L,and it has a relatively constant value when the concentration is above 1.0 mol/L.