Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 80, Issue 1, Pages 177-180Publisher
SPRINGER
DOI: 10.1007/s10973-005-0632-7
Keywords
activation energy; crystallization; DSC; isoconversional method; kinetics
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By applying an advanced isoconversional method to DSC data one can evaluate a dependence of the effective activation energy (the temperature coefficient of the growth rate) on the relative extent of melt crystallization. The conversion dependence can further be converted into a temperature dependence and parameterized in terms of the Hoffman-Lauritzen equation. For poly(ethylene terephthalate) (PET) we observe a transition from regime I to II. Poly(ethylene oxide) (PEO) crystallization appears to begin in regime II and then undergoes 2 consecutive changes that however cannot be clearly interpreted as regime III. The K-g and sigma sigma(c) parameters obtained for regime I and II (PET) and regime II (PEO) are consistent with the respective parameters reported for isothermal crystallization.
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