Isoconversional Approach to Evaluating the Hoffman-Lauritzen Parameters (U and Kg) from the Overall Rates of Nonisothermal Crystallization

An equation has been derived that correlates the temperature coefficient of the growth rate with the temperature dependence of the effective activation energy of the overall crystallization rate, which can be measured by differential scanning calorimetry. The dependence is evaluated by using an adva...

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Vydáno v:Macromolecular rapid communications. Ročník 25; číslo 6; s. 733 - 738
Hlavní autoři: Vyazovkin, Sergey, Sbirrazzuoli, Nicolas
Médium: Journal Article
Jazyk:angličtina
Vydáno: Weinheim WILEY-VCH Verlag 01.03.2004
WILEY‐VCH Verlag
Wiley
Témata:
activation energy
Applied sciences
Crystallization
differential scanning calorimetry (DSC)
Exact sciences and technology
isoconversional method
kinetics (polym.)
Organic polymers
Physicochemistry of polymers
Properties and characterization
Data analysis
Temperature coefficient
Melt crystallization
Non isothermal condition
Temperature effect
Polymer
Kinetics
Experimental study
Activation energy
Computing method
ISSN:1022-1336, 1521-3927
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Popis
Shrnutí:An equation has been derived that correlates the temperature coefficient of the growth rate with the temperature dependence of the effective activation energy of the overall crystallization rate, which can be measured by differential scanning calorimetry. The dependence is evaluated by using an advanced isoconversional method and is parameterized in terms of the Hoffman–Lauritzen equation. The parameters obtained for the nonisothermal crystallization of the poly(ethylene terephthalate) melt are consistent with the parameters reported for isothermal crystallization. The fit of the equation derived here is shown for data corresponding to the dependence of the effective activation energy on average temperature (fit = solid line).
Bibliografie:ark:/67375/WNG-1C14CSB4-K
ArticleID:MARC200300295
istex:A77969D14C389BA1BBD4B36D87D1856A678C379C
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200300295