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Journal of Materials Science

, Volume 42, Issue 2, pp 483–489 | Cite as

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

  • M. J. Starink
Article

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(T o ). An analytical equation is derived which describes the deviations introduced by this assumption. 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 T o is within about 50 to 70 K 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 reactions 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.

Keywords

Differential Scanning Calorimetry Temperature Integral Isoconversion Method Dehydration Reaction Cure Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Dr Nong Gao is gratefully acknowledged for performing DSC experiments presented in Figure 4.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Materials Research Group, School of Engineering SciencesUniversity of SouthamptonSouthamptonUK

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