The slow polarization phenomena of interfaces between particles of micro-SiO/sub 2/ or nano-SiO/sub x/ and low-density polyethylene

The nano-SiO/sub x//low-density polyethylene (LDPE) and micrometer-SiO/sub 2//LDPE composites were prepared by the double-solution method and 7 /spl mu/m thin films were prepared by the spin-coating method. The characteristics of discharging current vs. time of pure LDPE and the composites containing nano-SiO/sub x/ or micrometer SiO/sub 2/ were measured, respectively. The dielectric spectra of /spl epsiv/'(/spl omega/)IXepsiv;"(/spl omega/) and tan/spl delta/(/spl omega/) were investigated by Fourier transform method in frequency domain. It is found that the slow polarization in the nano-SiOx/LDPE composite differs from those of the micrometer SiO/sub 2//LDPE composite and pure LDPE distinctly. It also can be seen that the polarization peak of the nano-SiOx/LDPE composite is much lower than that of LDPE in frequency domain, as well as the location of polarization peak of the nano-SiOx/LDPE is lower than that of LDPE in frequency domain. The slow polarization of all samples was discussed in detail at last.