Molecular mobility in polyurethane/styrene-acrylonitrile blends studied by dielectric techniques

Kanapitsas, A; Pissis, P; Garcia Estrella, A

dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Garcia Estrella, A	en
dc.date.accessioned	2014-03-01T01:14:50Z
dc.date.available	2014-03-01T01:14:50Z
dc.date.issued	1999	en
dc.identifier.issn	0014-3057	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13241
dc.subject	Dielectric Relaxation	en
dc.subject.classification	Polymer Science	en
dc.subject.other	VITREOUS IONIC CONDUCTORS	en
dc.subject.other	POLYMER BLENDS	en
dc.subject.other	ALPHA-RELAXATION	en
dc.subject.other	THERMAL-ANALYSIS	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	COPOLYMERS	en
dc.subject.other	LIQUIDS	en
dc.subject.other	GLASSES	en
dc.subject.other	STYRENE	en
dc.title	Molecular mobility in polyurethane/styrene-acrylonitrile blends studied by dielectric techniques	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0014-3057(98)00075-5	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0014-3057(98)00075-5	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	We report in this work the results of dielectric studies on microphase separation in blends of thermoplastic polyurethanes (TPUs) and styrene-acrylonitrile (SAN) copolymers with 0, 25, 50, 90 and 100% SAN (w/w). The dielectric techniques used include broadband ac dielectric relaxation spectroscopy (DRS, in the frequency range of 10(-2) to 10(7) Hz and a temperature range of 20-200 degrees C, and thermally stimulated depolarization currents (TSDC) techniques in the temperature range of -170-30 degrees C. These techniques enable us to observe the primary alpha relaxations and the secondary gamma and beta relaxations of TPU and SAN in the pure components and in the blends and to follow the dependence of their characteristic parameters on composition. DRS proves to be very sensitive in monitoring the melting of the crystalline soft segments of TPU in the blends. In addition the investigation of de conductivity effects in the blends provides information on the morphology of the blends at mesoscopic level. The results suggest that the extent of partial miscibility of the two components is very limited, whereas the addition of SAN in TPU promotes the separation of hard and soft segments in TPU. (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)00075-5	en
dc.identifier.isi	ISI:000080001600018	en
dc.identifier.volume	35	en
dc.identifier.issue	5	en
dc.identifier.spage	923	en
dc.identifier.epage	937	en