引用本文:
张兴元, 古川猛夫. 铁电共聚物VDF/TrFE的低温低频介电松弛[J]. 应用化学,
1994, 11(2): 7-12.
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.
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.
铁电共聚物VDF/TrFE的低温低频介电松弛
English
Dielectric Relaxation of VDF/TrFE Copolymer Ferroelectric at Low Temperature and Frequency
Abstract:
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 Tc 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 Tg (=-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.
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Key words:
- vinylidene fluoride
- / trifluoroethylene
- / copolymer
- / molecular motion
- / dielectric relaxation
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