Activation energy determination for linear heating experiments: deviations due to the low temperature end of the temperature integral


Starink, M.J. (2007) Activation energy determination for linear heating experiments: deviations due to the low temperature end of the temperature integral. Journal of Materials Science, 42, 483-489. (doi: 10.1007/s10853-006-1067-7).

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Description/Abstract

Model-free isoconversion methods which use approximations of the temperature integral are generally reliable methods for the calculation of activation energies of thermally activated reactions studied during linear heating. These methods generally neglect the temperature integral at the start of the linear heating, I(To). An analytical equation is derived which describes the deviations introduced by this approximation. It is shown that for most reactions encountered this assumption does not have a significant influence on the accuracy of the method. However, in cases where To is within about 50 to 70K of the reaction stage to be investigated and activation energies are relatively low, significant deviations are introduced. It is shown that some of the published thermal analysis work on activation energy analysis of reaction occurring at relatively low temperatures is affected by these deviations. Examples are specific cases of dehydration reactions, cure reactions and cluster formation in Al alloys.

Item Type: Article
ISSNs: 0022-2461 (print)
Related URLs:
Keywords: thermally activated reaction, activation energy, thermal analysis, linear heating, curing, DSC, crystallisation, diffusion, polymer, metal, alloy, Al-Cu-Mg, temperature integral, Arrhenius integral, hydrated, Co(II) methanesulfonate
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QD Chemistry
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 19255
Date Deposited: 30 Jan 2006
Last Modified: 27 Mar 2014 18:08
Contact Email Address: m.j.starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/19255

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