Premium
Variation of the Effective Activation Energy Throughout the Glass Transition
Author(s) -
Vyazovkin Sergey,
Sbirrazzuoli Nicolas,
Dranca Ion
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400268
Subject(s) - activation energy , polystyrene , glass transition , materials science , polymer , ethylene oxide , poly ethylene , boron , ethylene , polymer chemistry , chemistry , analytical chemistry (journal) , composite material , catalysis , organic chemistry , copolymer
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.