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 (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. image Variation in the effective activation energy of PS, PET, and B2O3 with temperature.
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Vyazovkin et al. (2004) studied this question.
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