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Hoffman-Lauritzen parameters for non-isothermal crystallization of poly(ethylene terephthalate) and poly(ethylene oxide) melts |
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| Authors: | S Vyazovkin J Stone N Sbirrazzuoli |
| Institution: | (1) Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA;(2) Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA;(3) Thermokinetic Group, Laboratory of Chemistry of Organic and Metallic Materials, University of Nice - Sophia Antipolis, 06108 Nice Cedex 2, France |
| Abstract: | Summary 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 Kg and  e parameters obtained for regime I and II (PET) and regime II (PEO) are consistent with the respective parameters reported for isothermal crystallization. |
| Keywords: | kinetics crystallization DSC activation energy isoconversional method |
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