Cooperative relaxations/transitions in ferroelectric polymers |
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Authors: | G. Teyssèdre A. Bernès C. Lacabanne |
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Affiliation: | (1) Solid State Physics Laboratory, Ura CNRS 74, Paul Sabatier University, 118 Route de Narbonne, 31078 Toulouse, France |
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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. |
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Keywords: | dielectric relaxation DSC ferroelectric polymers TSC spectroscopy |
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