in a Vinylidene Fluoride
Trifluoroethylene Copolymer
I. A. Malyshkina*1, N. D. Gavrilova*, and K. A. Verkhovskaya**
* Faculty of Physics, Moscow State University,
Vorob’evy gory, Moscow, 119899 Russia
** Shubnikov Institute of Crystallography, Russian Academy of Sciences,
Leninskii pr. 59, Moscow, 117333 Russia
Received April 27, 2000;
Revised Manuscript Received June 28, 2000
Abstract—Vinylidene fluoride–trifluoroethylene copolymer films containing the polar dopant rhodamine 6G
in different concentrations (from 0 to 1.5 wt %) were studied by low-frequency (20 Hz–20 kHz) dielectric spec-
troscopy over a wide temperature range including the ferroelectric phase transition. A conclusion was drawn
that the dopant is primarily incorporated in the amorphous phase of the polymer; the pattern of the obtained
Cole–Cole plots indicates a significant influence of the through conductance on the low-frequency dielectric
spectra of doped copolymer samples. As the amount of dopant increases, the most probable relaxation time
increases, which may be due either to the emergence of macrodipoles produced from rhodamine 6G molecules
and the copolymer or to an increase in their size.
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