Preparation and Electrical Properties of SWNTs/PI Composites

The single-walled carbon nanotubes(SWNTs) filled nanocomposites SWNTs/ polyimide(PI) with good uniformity,dispersion and alignment of SWNTs and with different SWNTs concentrations were produced by melt-mixing techniques and repeated stretching method.The problems of alignment and dispersion of SWNTs in the composite matrix and the electrical properties of composites were studied.The electrical properties of composites rise with the increase of SWNT concentration,composites show higher electrical conductivities along the stretched direction than perpendicular to it.The percolation threshold value along the stretching direction is lower than the value perpendicular to the SWNTs orientation.Anymore,the well dispersion and alignment of SWNTs in the SWNT/polymer composites present a low value of percolation threshold.