Abstract: In this paper, the structure of poly(vinylidene fluoride)(PVDF) was analyzed by X-ray diffraction(XRD) and Fourier transform infrared(FTIR). It was found that melt crystallized PVDF contained mainly α phases. The dielectric properties of PVDF were investigated by broadband dielectric spectroscopy(BDS) spanning 10-1~107 Hz and -100~100 ℃. There were relaxation peaks of α-PVDF at 40~100 ℃ originated from glass transition and δ-PVDF at -100~-50 ℃ originated from polarization behavior of molecular motion at amorphous regions.

Key words: poly(vinylidene fluoride), broadband, dielectric spectroscopy, dielectric property