New Generation Radiation-Grafted PVDF-g-VBC based Dual-Fiber Electrospun Anion Exchange Membranes

Kırlıoğlu, Ahmet Can
Mojarrad, Naeimeh Rajabalizadeh
Alkan Gürsel, Selmiye
Güler, Enver
Yarar Kaplan, Begüm
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International Journal of Hydrogen Energy
Anion Exchange Membranes (AEM) have the potential to solve the cost issues of fuel cell technologies due to their basic environment that can allow the use of cheaper components. However, there is still a need to develop an ideal inexpensive, mechanically robust AEM with high ionic conductivity and ion exchange capacity (IEC). In this work, we present various dual-fiber electrospun membranes based on a novel radiation-grafted copolymer. First, the synthesis route of radiation-induced grafting of vinyl benzyl chloride (VBC) onto poly(vinylidene fluoride) (PVDF) to prepare PVDF-g-VBC was optimized. Then, PVDF-g-VBC powders were used to fabricate dual-fiber electrospun mats with inert PVDF and commercial Fumion-FAA-3 ionomer. Dual-fiber electrospun mats were hot-pressed and then quaternized with trimethylamine. Finally, mechanical properties, ion exchange capacity, ionic conductivity, and morphology of these prepared dual-fiber electrospun membranes were investigated. The dual-fiber membrane prepared with PVDF-g-VBC (88% of the total weight of the membrane) and PVDF: Fumion-FAA-3 (1:2) mix (12 wt%) realized ionic conductivity of 4.67 mS/cm at 25 oC, high ion exchange capacity of 1.35 mmol/g with Young’s Modulus of 761 MPa. The membrane based on the combination of radiation grafting and dual-fiber electrospinning was prepared for the first time in literature and offers the prospect of tuning and fine-control of mechanical and physicochemical properties of AEMs.
Published by International Journal of Hydrogen Energy;; Ahmet Can Kırlıoğlu, Naeimeh Rajabalizadeh Mojarrad, Selmiye Alkan Gürsel, Sabanci University, Faculty of Engineering and Natural Sciences, 34956, Istanbul, Turkey; Begüm Yarar Kaplan, Selmiye Alkan Gürsel, Sabanci University, SUNUM Nanotechnology Research Center, 34956, Istanbul, Turkey; Enver Güler, Atılım University, Department of Chemical Engineering, 06830 Ankara, Turkey.
Dual-fiber electrospinning; Radiation-induced grafting; Anion exchange membrane; Fuel cells