Analysis of the dielectric relaxation during crystallization of glassy polymer PEKK.

The dielectric alpha relaxation occuring during isothermal crystallization of a glassy polymer PEKK [poly(aryl ether ketone ketone)), has been recently measured in real time as crystallization proceeds [Ezquerra et al., Phys. Rev. B 50, 6023 (1994)]. We use these new experimental data and the SchOnhals-Schlosser model to interpretation of the dielectric loss line shape of PEKK during crystallization. Once the crystallization proceeds, the values of the intramolecular diffusional hinderance parameter alpha, slightly decrease. Relatively fast, internal diffusion along polymer chain becomes a bit more hindered as a result of environmental changes creates by crystallization process. Contrary, the intermolecular correlation parameter kappa is very sensitive to the crystallization process.