Glass transition in polymers: (In)correct determination of activation energy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F13%3A39896436" target="_blank" >RIV/00216275:25310/13:39896436 - isvavai.cz</a>
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S0032386113000219" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0032386113000219</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymer.2013.01.002" target="_blank" >10.1016/j.polymer.2013.01.002</a>

Result language
angličtina
Original language name
Glass transition in polymers: (In)correct determination of activation energy
Original language description
The possibility of applying Kissinger-type equations for the evaluation of apparent activation energy in the case of the glass transition phenomenon was investigated. Theoretically simulated data based on the generally accepted Tool-Narayanaswamy-Moynihan model were used to represent all possible cases of structural relaxation behavior. The values of apparent activation energy determined by Kissinger-type equations were in major disagreement with the original values of Delta h* used as the input data for the simulations. In addition, a large dependence of the Delta h* evaluations on the thermal history of the glass was found in the case of all tested equations. The latter points to a significant systematic error in the currently commonly accepted methodology, resulting in a fundamental contradiction with the principle/concept of activation energy as a physico-chemical quantity. In light of these facts, usage of Kissinger-type equations for the evaluation of the "glass transition activa
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
<a href="/en/project/GPP106%2F10%2FP035" target="_blank" >GPP106/10/P035: Relaxation processes in non-crystalline materials</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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