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通过研究PVA/PAA复合膜红外光谱特性,扫描电镜分析,及电场作用下膜通量的变化,阐明了PVA/PAA复合膜的电响应特性和规律。研究结果表明:制备的PVA/PAA复合膜中PVA与戊二醛已经发生交联反应形成酯键;-COOH基团的离子化是产生电响应的必要条件。随着PAA含量的增加,膜通量也明显的增加,表明体系中离子基团的数量(浓度)能够强烈影响PVA复合膜的直流电响应性;随着电场强度的增大,膜通量增加;在离子强度小于0.01mol/L时,膜通量随离子强度的增加而增加,但当离子强度大于0.01mol/L时,膜通量则呈现下降的趋势。在实验条件下,比较理想电响应条件为PVA∶PAA=1∶1,溶液离子强度为0.01mol/L。
The electrical response characteristics and regularity of PVA / PAA composite membrane were elucidated by studying the infrared spectra of PVA / PAA composite membrane, scanning electron microscopy analysis and membrane flux changes under electric field. The results show that the PVA / PAA composite membrane has been cross-linked by PVA and glutaraldehyde to form ester bond. The ionization of -COOH group is the necessary condition to produce electrical response. With the increase of PAA content, membrane flux also increased obviously, indicating that the number of ionic groups (concentration) in the system can strongly affect the DC response of PVA composite membrane. With the increase of electric field intensity, membrane flux increased. When the ionic strength is less than 0.01mol / L, the membrane flux increases with the increase of ionic strength, but when the ionic strength is greater than 0.01mol / L, the membrane flux shows a downward trend. In the experimental conditions, the ideal electrical response conditions PVA: PAA = 1: 1, the ionic strength of the solution is 0.01mol / L.