Novel Metal-Polymer Composite with High Percolation threshold
Type of Degreethesis
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0-3 metal-polymer composite based on nano-size Ni particles was studied. A nanocomposite with nano-size Ni particles embedded into copolymer poly [vinylidene fluoride-co-trifluoroethylene] P(VDF-TrFE) 70/30 mol% has been prepared via a hot-pressed solution casting method. The uniform dispersion of Ni nanoparticle is improved by the processing method and the dielectric properties of composite films on volume fraction of Ni are fully investigated over a frequency range of 100Hz~1MHz. The percolation threshold of the composite is pretty large (53 vol%), attributed to increased adhesiveness between the filler and the polymer and better homogeneity of filler dispersion. Meanwhile, the dielectric constant of Ni nanoparticle-P(VDF-TrFE) 70/30 composite film is about 300 at 1000 Hz with low dielectric loss of 0.2, showing the potential for applications in advance electronics. For the Ni-P(VDF-TrFE) composite, temperature dependence of dielectric properties has been demonstrated within Ni-P(VDF-TrFE) 70/30 mol% composites due to the temperature dependence of polymer matrix. In order to understand the dielectric behaviors of conductor-dielectric composites, the percolation equation was investigated further.