THE DEFECT DIFFUSION MODEL AND TIMES OF POLYMERS

Authors:
  • ADAlberto D’amore
    Alberto D’amore
  • DADomenico Acierno
    Domenico Acierno
  • LGLuigi Grassia
    Luigi Grassia
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Abstract
The defect diffusion model (DDM) has been used to explain a wide variety of experimental results [1–4]. This includes the electrical relaxation time, electrical conductivity and viscosity of various materials above the glass transition temperature, T g . In each case the pressure, temperature and volume variation of the physical property was calculated. In the present note, it is shown how the formalism can be used to account for the electrical relaxation time data of Heinrich and Stoll [5] for PVAc. In addition, the analysis is extended to the ratio of the isochoric activation energy to isobaric activation enthalpy known as E v /E p or E v * /H* which elucidates the contributions of volume and temperature to the electrical relaxation time.