| In the electric insulation field, we discover the nano-paticles adding in thedielectrics would observably change the properties of the polymers. Consideringon the special size of the nano-paticle and the complex morphology of thepolymer, the study of the interface is very difficulty. In our study, we chose thenanopore polymers to discuss the interface and the charge transport in polymernano-composites, which included relative “pure” interfaces.Firstly by means of the Infrared Spectroscopy (IR) and X-ray Diffraction(XRD), we understood the composition and structure of the nanoporepolycarbonate (PC) film.To investigate the dielectric properties of nanopore PC, the frequencydomain spectroscopy and the dielectric constant following by the temperaturewere both measured, meanwhile we got the conduction current of nanopore PCfilm. The nanopore PC films with two kinds of pore diameters (15nm and50nm)were measured by broadband dielectric/impedance spectrometer; we got the acconductivity, the complex dielectric constant real part and imaginary partfollowed by frequency and temperature. Finally we combined the nanopore PCfilms’ dielectric spectras with their dc conductivities. Experimental resultsshowed that: with increasing temperature, the relaxation polarization of thenanopore PC films which occurred in low frequency shifted towards highfrequency, meanwhile, the nanopore PC generated obvious low-frequencydiffusion. It could be deduced from above results that the permittivity of15nmPC film was smaller in high frequency as a result of more air pores; at highertemperature due to more interfaces and obvious low-frequency diffusion, thepermittivity of the15nm PC was larger. The result at high temperature could befully understood by means of universal relaxation law. |
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