A dielectric study of molecular mobility at glass transition

Pissis, P; Apekis, L

dc.contributor.author	Pissis, P	en
dc.contributor.author	Apekis, L	en
dc.date.accessioned	2014-03-01T01:08:12Z
dc.date.available	2014-03-01T01:08:12Z
dc.date.issued	1991	en
dc.identifier.issn	0022-3093	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10335
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026413626&partnerID=40&md5=95d90cddf6faf86aafca4ba6d464c772	en
dc.subject.classification	Materials Science, Ceramics	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Block Copolymers - Glass Transition	en
dc.subject.other	Calorimetry	en
dc.subject.other	Dielectric Properties	en
dc.subject.other	Glycols	en
dc.subject.other	Liquids - Phase Transitions	en
dc.subject.other	Differential Scanning Calorimetry	en
dc.subject.other	Glass Transition	en
dc.subject.other	Molecular Mobility	en
dc.subject.other	Thermally Stimulated Depolarization Currents (TSDC)	en
dc.subject.other	Thermograms	en
dc.subject.other	Polyurethanes	en
dc.title	A dielectric study of molecular mobility at glass transition	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	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
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Non-Crystalline Solids	en
dc.identifier.isi	ISI:A1991FV57400019	en
dc.identifier.volume	131-133	en
dc.identifier.issue	PART 1	en
dc.identifier.spage	95	en
dc.identifier.epage	98	en