Dielectric studies of glass transition in confined oligomers of propylene glycol

Daoukaki, D; Spanoudaki, A; Kyritsis, A; Pelster, R; Nimtz, G; Pissis, P

dc.contributor.author	Daoukaki, D	en
dc.contributor.author	Spanoudaki, A	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pelster, R	en
dc.contributor.author	Nimtz, G	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:14:31Z
dc.date.available	2014-03-01T01:14:31Z
dc.date.issued	1999	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13118
dc.subject	Dielectric Relaxation	en
dc.subject	Glass Transition	en
dc.subject	Propylene Glycol	en
dc.subject	Molecular Weight	en
dc.subject.other	Dielectric properties	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Glass transition	en
dc.subject.other	Hydrophobicity	en
dc.subject.other	Molecular weight	en
dc.subject.other	Porosity	en
dc.subject.other	Surfaces	en
dc.subject.other	Thermal effects	en
dc.subject.other	Thin films	en
dc.subject.other	Broadband dielectric relaxation spectroscopy	en
dc.subject.other	Confined oligomers	en
dc.subject.other	Propylene glycols	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	Oligomers	en
dc.title	Dielectric studies of glass transition in confined oligomers of propylene glycol	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/ISE.1999.832093	en
heal.identifier.secondary	http://dx.doi.org/10.1109/ISE.1999.832093	en
heal.publicationDate	1999	en
heal.abstract	We report the results of the detailed studies of confinement on the glass transition of propylene glycol (PG) and its oligomers (PPGs). The molecular weight (MW) of the oligomers was 400, 1200 and 2000. Vycor glass (VG), characterized by a narrow distribution of pore diameters around 4.0 nm, was used for confinement. Both native and chemically treated glasses to render the inner pore surfaces hydrophobic were used. The techniques employed include thermally stimulated depolarization currents (TSDC) and broadband dielectric relaxation spectroscopy (DRS). Compared to bulk liquids, confinement was found to cause a shift of the α relaxation, associated with the glass transition, to higher frequencies/lower temperatures and a broadening of the response. Cooperatively effects are thought to be responsible for these changes.	en
heal.publisher	IEEE, Piscataway, NJ, United States	en
heal.journalName	Proceedings - International Symposium on Electrets	en
dc.identifier.doi	10.1109/ISE.1999.832093	en
dc.identifier.spage	497	en
dc.identifier.epage	500	en