Unified isothermal and non-isothermal modelling of neat PEEK crystallization
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A differential generalized Avrami’s law is used to model crystallization kinetic of PEEK in considering that PEEK crystallization results from the contribution of two distinct mechanisms. The form of this equation allows to predict with good accuracy both isothermal and non-isothermal crystallization kinetics. Nevertheless, isothermal model parameters are not entirely satisfactory for predicting non-isothermal crystallization and the identification of kinetic parameters is needed for both isothermal and non-isothermal cases. The results show that the Avrami exponents and Arrhenius activation energies remain constant for both conditions and therefore suggest that these parameters are only material dependent. On the other hand, the other kinetic parameters depend on the crystallization condition and vary with temperature and/or cooling rate.
KeywordsPEEK Crystallization Kinetic modelling Differential scanning calorimetry (DSC)
This work was carried out as part of the cooperative INMAT2 project and was financially supported by the Fond Unique Interministériel. The authors wish to thank the project partners for their contribution to the present work. Further thanks are addressed to the technicians of the Institut Clément Ader for their assistance in the experiments.
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