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ELECTRICAL AND MECHANICAL PROPERTIES OF GRAPHITE- BASED POLYMER COMPOSITES FOR BIPOLAR PLATES IN PEM FUEL CELLS

Graphite-filled phenolic resin composites (BBP4) are developed and characterized to be used as bipolar plates in Proton Exchange Membrane Fuel Cells (PEMFC). BBP4 has in plane electrical conductivity of 130 S/cm, thermal conductivity of 26 W/m K and flexure strength of 49 MPa. These values well exceed the US Department of Energy (DOE) requirements. In addition this work presents a comparative study of the effect of the polymer type on the thermal, electrical and mechanical properties. For this purpose four graphite-based thermoplastic composite are investigated using respectively four polymers matrix systems: Poly (vinylidene fluoride) (PVDF), poly (phenylene sulfide) (PPS), polypropylene Glycol (PPG86) and polypropylene (PPU). The effect of carbon black on the properties of the polypropylene/graphite composite is determined.