Title :
Use of high frequency dielectric spectroscopy to investigate ferroelectric and melting transitions in copolymers of vinylidene fluoride
Author :
Furukawa, T. ; Tajitu, Y. ; Johnson, G.E. ; Anderson, E.W.
Author_Institution :
RIKEN, Tokyo, Japan
fDate :
29 Oct-2 Nov 1989
Abstract :
The dielectric strength Δε and the relaxation time τ in copolymers of vinylidene fluoride (VDF) are evaluated in terms of a dipolar two-site model in the ferro, para, and melt regimes. It is shown that the two-site model can be applied to the experimental data to give a good qualitative understanding of the relaxation behavior of the copolymers of VDF. As an example, Δε and τ of BDF/TrFE (trifluoroethylene) (65/35) are shown as a function of temperature on heating and subsequent cooling at 0.5°C/min. The temperature-dependent remnant polarization which fits the ferro-para transition on heating is also shown
Keywords :
dielectric polarisation; dielectric relaxation; electric strength; ferroelectric materials; ferroelectric transitions; melting; permittivity; polymer blends; 23 to 160 C; copolymers of vinylidene fluoride; dielectric strength; dipolar two-site model; ferroelectric transitions; high frequency dielectric spectroscopy; melting transitions; relaxation time; temperature-dependent remnant polarization; vinylidene fluoride trifluoroethylene copolymer; Automatic control; Calibration; Data analysis; Dielectric breakdown; Electrochemical impedance spectroscopy; Ferroelectric materials; Frequency; Permittivity; Polarization; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1989. Annual Report., Conference on
Conference_Location :
Leesburg, VA
DOI :
10.1109/CEIDP.1989.69583
