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.