Evaluation of electrochemical and morphological properties of PES/PVP blend heterogeneous cation-exchange membranes by using Taguchi experiment design method
Paper ID : 1384-MST2015-FULL
Ahmad Moheb *1, Amir Ehsanian mofrad2, Morteza Sadeghi3
1Isfahan University of Technology
2Chemical engineering faculty, isfahan university of technology
3isfahan university of technology
In the present paper, the results of fabricating and evaluation of heterogeneous cation exchange membranes made by dispersing of cation exchange resins in polyethersulfone (PES) / polyvinylpyrolydone (PVP) mixtures are reported. Heterogeneous cation exchange membranes are usually obtained by solution-casting and phase inversion technique. Size and amount of cation exchange resins, membrane thickness and type of solvents are some influential parameters considered in studies of heterogeneous IEM fabrication. Although increase of resin loading can augment the potential, water absorption and membrane selectivity, but by increasing resin loading the membrane becomes more brittle. Therefore it seems there is an optimum value for the amount of resin in the membrane. In the present work, to study the performance of membranes, five characteristics of membranes were evaluated by proper techniques. Also, SEM micrographs were used to investigate the morphology of the membranes. Four factors of portion of polymer blend, PVP to PES ratio, resin to polymer ratio, and drying temperature, each of them as 4 levels, were considered as controlling variables and 16 experiments were designed by using Taguchi method. Maximum values of 1.52 meq/g and 46.6 mV were obtained for IEC and electrical potential, respectively. In the case of water uptake, the optimum synthesized membrane showed 23.1% water uptake. In addition, the sample with the highest oxidation stability lost only 25.2% of its initial weight in oxidant solution. The best obtained value from permeability tests was 1.33 m/s. By using Taguchi method it was possible to determine the optimum condition of each parameters.
Heterogeneous cation exchange membrane; Polyethersulfone, Ion exchange capacity; Water uptake.
Status : Paper Accepted (Poster Presentation)