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Glass transition in polymers: (In)correct determination of activation energy
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Polymer
Publisher name: Elsevier Science
Place: Oxford
Page from-to: 1504-1511
Titles:
Language Name Abstract Keywords
cze Skelný přechod v polymerech: (Ne)správné stanovení aktivační energie Možnost aplikovat Lissingerovu rovnici na výpočet zdánlivé aktivační energie v případě fenom=nu skelné transfromace byla zkoumána. Teoreticky simulovaná data založená na základním TNM modelu byla použita k prezentaci všech možných případů relaxačního chování. Hodnoty získané analýzou na základě Kissingerovy rovnice byly v nesouladu s původními hodnotami použitými v simulaci. kinetika skelního přechodu; TNM model; zdánlivá aktivační energie
eng Glass transition in polymers: (In)correct determination of activation energy 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 activation energy" was shown to be incorrect. glass transition kinetics; TNM model; apparent activation energy

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