Publication Type Journal Article
Title Dielectric relaxation study of poly (ether imide) by thermally stimulated depolarization currents
Authors H. P. Diogo J. J. Moura-Ramos
Groups BioMol
Journal JOURNAL OF APPLIED POLYMER SCIENCE
Year 2022
Month
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Volume 139
Number 3
Pages
Abstract This work presents a detailed study, by thermostimulated depolarization currents, of the molecular mobility of poly (ether imide) in a broad temperature range covering the amorphous solid state, the glass transition, and the rubber state. Taking advantage of the very wide distribution of motional modes of the PEI glass transition (the broadest of all known glass formers), we carried out an in-depth study of physical aging involving different modes, which provided a more comprehensive view of the aging process. We also analyzed in detail the mobility below T-g where, in addition to the fast secondary relaxation, we identified a Johari-Goldstein. In the rubber state, on the other hand, we detected a mobility but showed that it corresponds to space charge motions rather to dipolar reorientations.
DOI http://dx.doi.org/10.1002/app.51568
ISBN
Publisher
Book Title
ISSN 0021-8995
EISSN 1097-4628
Conference Name
Bibtex ID WOS:000690697000001
Observations
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