Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 268, Issue 1, Pages 96-108Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2005.06.009
Keywords
radiation grafted pore-filled membranes; simultaneous electron irradiations; methanol transport; DMFC
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Polystyrene suffonic acid (PSSA) pore-filled poly(vinylidene fluoride) (PVDF) membranes have been prepared using simultaneous electron irradiation method. Porous PVDF films were grafted by pre-swelling in styrene solution and subsequent irradiation with an electron beam (EB) under nitrogen atmosphere and at ambient temperature. The grafted films i.e. polystyrene (PS) pore-filled PVDF were subsequently suffonated with a diluted mixture of chlorosufonic acid. The effects of the reaction parameters on the content of PS grafted in the pores of PVDF films were investigated. The chemical and morphological properties of the membranes in comparison with their un-grafted and grafted counterparts were studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The transport properties of these membranes such as ionic conductivity and methanol permeability were evaluated and correlated with the content of PS grafted in the pores of the PVDF films. The PSSA pore-filled PVDF membranes with PS content in the pores of 40% and above showed superior performance characteristics compared to Nation 117 membrane and therefore can be potential alternatives to improve the performance of direct methanol fuel cell (DMFC). (c) 2005 Elsevier B.V. All rights reserved.
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