Phase transition and conductive properties of stainless steel fiber-graphite/ABS-PVDF composites

The electrical properties and rheology for polymer based conductive composites were investigated, in which acrylonitrile-butadiene-styrene copolymer (ABS) and polyvinylidene fluoride (PVDF) were used as the matrix and stainless steel fibers (SSF) and graphite were used as conductive fillers, and the SSF-graphite/ABS-PVDF conductive composites were prepared by melt-blending method. The distribution of conductive filler, the conductive property and phase transition behavior of SSF/ABS-PVDF composite system were studied. The results show that SSF tends to locate in the PVDF phase, and when the SSF content is 20wt%, the electrical resistivity of SSF/ABS-PVDF composites decreases firstly, and after then reaches a platform region, finally decreases again with the increase of PVDF ratio. Phase transition behavior occurs when content of PVDF is 30wt%-40wt% and 70wt%-80wt% in ABS-PVDF composite matrix. A double percolation phenomenon appeares in the SSF-graphite/ABS-PVDF composites when content of SSF is 16.84wt% and 25wt%-30wt% which is consistent with the tendency of dynamic modulus and complex viscosity.