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Citation: Zhang Xingyuan, Takeo Furukawa. Dielectric Relaxation of VDF/TrFE Copolymer Ferroelectric at Low Temperature and Frequency[J]. Chinese Journal of Applied Chemistry, ;1994, 11(2): 7-12. shu

Dielectric Relaxation of VDF/TrFE Copolymer Ferroelectric at Low Temperature and Frequency

Zhang Xingyuan ¹ ,
Takeo Furukawa ²

1.
1. Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026;
2.
2. The Institute of Physical and Chemical Research, Japan

Received Date: 20 July 1993
Available Online: 15 December 1993

The characteristics of molecular motion of the vinylidene fluoride (73)/trifluoro ethylene (27) copolymer ferroelectric have been investigated by dielectric relaxation measure-ments at low temperatures and low frequencies.With increase of the crystallinity of the copolymer,the Curie-point temperature T_c decreased and the dielectric constant increased in the region of ferroelectric-paraelectric phase transition.The frequency spectra of the copoly-mers below room temperature consisted of a low-frequency part ascribed to the micro-Brownian motion of molecular segments in the noncrystalline regions and a high-frequency part designated as the local motions of small-scale segments.The T_g (=-37℃) and △H (=48.8kJ/mol) of copolymers were obtained from the fitted results using two Cole-Cole functions andcalculation with WLF equation and Arrhenius formula respectively.
- vinylidene fluoride,
- trifluoroethylene,
- copolymer,
- molecular motion,
- dielectric relaxation
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