Dielectric studies of molecular mobility and microphase separation in segmented polyurethanes

Georgoussis, G; Kyritsis, A; Pissis, P; Savelyev, YuV; Akhranovich, ER; Privalko, EG; Privalko, VP

dc.contributor.author	Georgoussis, G	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Savelyev, YuV	en
dc.contributor.author	Akhranovich, ER	en
dc.contributor.author	Privalko, EG	en
dc.contributor.author	Privalko, VP	en
dc.date.accessioned	2014-03-01T01:14:31Z
dc.date.available	2014-03-01T01:14:31Z
dc.date.issued	1999	en
dc.identifier.issn	0014-3057	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13119
dc.subject	Dielectric Relaxation	en
dc.subject.classification	Polymer Science	en
dc.subject.other	CHAIN-END GROUPS	en
dc.subject.other	GLASS-TRANSITION	en
dc.subject.other	BLOCK-COPOLYMERS	en
dc.subject.other	RELAXATION SPECTROSCOPY	en
dc.subject.other	MORPHOLOGY	en
dc.subject.other	EXTENDERS	en
dc.title	Dielectric studies of molecular mobility and microphase separation in segmented polyurethanes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0014-3057(98)00288-2	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0014-3057(98)00288-2	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	This work deals with molecular mobility and microphase separation studies on segmented polyurethanes with different fragments, including crown ethers, as chain extenders and/or chain end groups. The techniques used include thermally stimulated depolarization current (TSDC) in the temperature range -185 degrees-30 degrees C and broadband dielectric relaxation spectroscopy (DRS) in the frequency and temperature ranges of 10(-2)-10(6) Hz and -55 degrees-80 degrees C. The combination of these techniques allowed the secondary gamma and beta mechanisms, the primary cc mechanism, the Maxwell-Wagner-Sillars (MWS) mechanism associated with interfacial polarization and de conductivity od, to be recorded. The results suggest that addition of crown ethers promotes microphase separation. Specific characteristics of the primary cc and the MWS relaxations and od, were found to systematically change with the degree of microphase separation. They should be further quantified and tested on selected systems. (C) 1999 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	European Polymer Journal	en
dc.identifier.doi	10.1016/S0014-3057(98)00288-2	en
dc.identifier.isi	ISI:000082704100012	en
dc.identifier.volume	35	en
dc.identifier.issue	11	en
dc.identifier.spage	2007	en
dc.identifier.epage	2017	en