A STEPWISE METHOD FOR THE CHARACTERIZATION OF NON-ISOTHERMAL CRYSTALLIZATION KINETICS OF POLY(ETHER ETHER KETONE) AT PROCESSING-RELEVANT COOLING RATES

International audienceIsothermal and non-isothermal crystallization kinetics of PEEK are investigated experimentally using fast scanning calorimetry. A stepwise method to derive the kinetics from interrupted crystallization tests is introduced. The evolution of crystallinity as a function of time is evaluated from the variation of specific heat capacity to avoid taking into account meltrecrystallization phenomena when integrating the melting enthalpy. This experimental work allows the construction of a continuous cooling transformation diagram, at cooling rates close to those of industrial processes