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Variation in Activation Energy of the Glass Transition for Polymers of Different Dynamic Fragility
Author(s) -
Vyazovkin Sergey,
Sbirrazzuoli Nicolas,
Dranca Ion
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600095
Subject(s) - fragility , glass transition , activation energy , polymer , materials science , thermodynamics , dynamic mechanical analysis , polymer chemistry , composite material , chemistry , physics
Summary: Variations of the effective activation energy E of glass transitions have been determined by applying an isoconversional method to DSC data on the glass transition in PVC, PBMA, PVP, and PEN. A variability parameter Δ E has been introduced to characterize the rate of decrease in E with increasing temperature. By using the present data and our previous results for PS, PET, and B 2 O 3 , it has been found that Δ E correlates with the values of dynamic fragility, increasing with the latter in approximately exponential fashion.Correlation of the variability parameter with the dynamic fragility.