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A dielectric study of molecular mobility at glass transition
This item is provided by the institution :
National Technical University of Athens
Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA
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ΕΚΤ item type
Journal part
(EN)
Scientific article
(EN)
EKT year
1991
(EN)
EKT historical period
Title
A dielectric study of molecular mobility at glass transition (EN)
Creator
Apekis, L (EN)
Pissis, P (EN)
Description
Molecular mobility at glass transition was studied by means of the thermally stimulated depolarization currents (TSDC) method in several glass-forming systems, including simply constituted liquids (propylene glycol), polymers (poly(propylene glycols)), and block co-polymers (polyurethanes). In all cases the TSDC thermogram was more complex than thermograms obtained with the same materials using other experimental techniques: classical ac dielectric methods, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). A sharp dipolar peak is always present in the TSDC thermograms at the glass transition temperature, as it is determined by DSC. The question is examined as to whether a part of the TSDC thermogram is due to space charge formation related to morphology changes at glass transition. The complex TSDC thermograms were experimentally decomposed into approximately single responses by means of special techniques offered by the TSDC method (thermal sampling techniques) and the spectra of activation energies and entropy factors were determined. © 1991. (EN)
Type
journalArticle (EN)
Subject
Thermograms (EN)
Glass Transition (EN)
Materials Science, Ceramics (EN)
Materials Science, Multidisciplinary (EN)
Liquids - Phase Transitions (EN)
Polyurethanes (EN)
Differential Scanning Calorimetry (EN)
Molecular Mobility (EN)
Thermally Stimulated Depolarization Currents (TSDC) (EN)
Block Copolymers - Glass Transition (EN)
Dielectric Properties (EN)
Calorimetry (EN)
Glycols (EN)
Provider
National Technical University of Athens
Repository / collection
Digital Library of National Technical University of Athens | Dspace@NTUA
Subcollections
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά
Journal
Journal of Non-Crystalline Solids (EN)
Language
English
Issued
1991 (EN)
Identifier
http://hdl.handle.net/123456789/10335
131-133 (EN)
PART 1 (EN)
ISI:A1991FV57400019 (EN)
95 (EN)
0022-3093 (EN)
98 (EN)
Publisher
ELSEVIER SCIENCE BV (EN)
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