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Variation of the Effective Activation Energy Throughout the Glass Transition

✍ Scribed by Sergey Vyazovkin; Nicolas Sbirrazzuoli; Ion Dranca

Publisher: John Wiley and Sons
Year: 2004
Tongue: English
Weight: 129 KB
Volume: 25
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.200400268

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✦ Synopsis

Abstract

Summary: 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 (B~2~O~3~). 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 B~2~O~3~. 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 B~2~O~3~ with temperature.

imageVariation in the effective activation energy of PS, PET, and B~2~O~3~ with temperature.

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