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Cooperative relaxations/transitions in ferroelectric polymers

  • Polymers
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Abstract

Dielectric relaxation and thermal transitions in β-PVDF have been investigated by Thermo-Stimulated Current spectroscopy and Differential Scanning Calorimetry respectively. A comparative study of spectra and thermograms has been performed.

The relaxation mode associated with the glass transition of the true amorphous phase is characterized by relaxation times obeying a compensation law due to cooperative molecular movements. A conformationally disordered structure is proposed for β-PVDF to explain thermal events occurring around 60°C. Ageing of ferroelectric properties of β-PVDF has been associated with cooperative molecular movements liberated largely below the melting point.

Zusammenfassung

Mittels TSC und DSC wurden die Dipolrelaxation und thermische Umwandlungen von β-PVDF untersucht und dann eine vergleichende Analyse der Spektren und Thermogramme durchgeführt.

Die Realaxationsart bei der Glasumwandlung der echten amorphen Phase wird wegen zusammenhängender Molekülbewegungen durch Relaxationszeiten gekennzeichnet, die dem Kompensationsgesetz folgen. Zur Deutung der thermischen Vorgänge bei 60°C wird für β-PVDF eine konformativ ungeordnete Struktur vorgeschlagen. Die Alterung der ferroelektrischen Eigenschaften von β-PVDF wird mit den zusammenhängenden Molekülbewegungen in Zusammenhang gebracht, die unterhalb des Schmelzpunktes ausgeführt werden.

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Authors and Affiliations

  1. Solid State Physics Laboratory, Ura CNRS 74, Paul Sabatier University, 118 Route de Narbonne, 31078, Toulouse, France

    G. Teyssèdre, A. Bernès & C. Lacabanne

Authors
  1. G. Teyssèdre
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  2. A. Bernès
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  3. C. Lacabanne
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Teyssèdre, G., Bernès, A. & Lacabanne, C. Cooperative relaxations/transitions in ferroelectric polymers. Journal of Thermal Analysis 40, 711–719 (1993). https://doi.org/10.1007/BF02546643

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