Variation of the Effective Activation Energy Throughout the Glass Transition

Variation of the Effective Activation Energy Throughout the Glass Transition

An advanced isoconversional method has been applied to determine the effective activation energies (E) for the glass transition in polystyrene (PS), poly(ethylene terephthalate) (PET), and boron oxide (B2O3). The values of E decrease from 280 to 120 kJ · mol−1 in PS, from 1 270 to 550 kJ mol−1 in PE...

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Veröffentlicht in:Macromolecular rapid communications. 2004-10, Vol.25 (19), p.1708-1713
Hauptverfasser: Vyazovkin, Sergey, Sbirrazzuoli, Nicolas, Dranca, Ion
Format: Artikel
Sprache:eng
Schlagworte:
activation energy
Applied sciences
differential scanning calorimetry (DSC)
Exact sciences and technology
glass transition
isoconversional method
kinetics (polym.)
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Zusammenfassung:An advanced isoconversional method has been applied to determine the effective activation energies (E) for the glass transition in polystyrene (PS), poly(ethylene terephthalate) (PET), and boron oxide (B2O3). The values of E decrease from 280 to 120 kJ · mol−1 in PS, from 1 270 to 550 kJ mol−1 in PET, and from 290 to 200 kJ mol−1 in B2O3. It is suggested that a significant variation in E should be observed for the fragile glasses that typically include polymers. Variation in the effective activation energy of PS, PET, and B2O3 with temperature.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200400268