Phase behavior and molecular mobility in polyurethane/styrene-acrylonitrile blends

Vatalis, AS; Kanapitsas, A; Delides, CG; Viras, K; Pissis, P

dc.contributor.author	Vatalis, AS	en
dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Delides, CG	en
dc.contributor.author	Viras, K	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:16:56Z
dc.date.available	2014-03-01T01:16:56Z
dc.date.issued	2001	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14278
dc.subject	polymer blends	en
dc.subject	crosslinked polyurethanes	en
dc.subject	styren-acrylonitrile copolymer	en
dc.subject	microphase separation	en
dc.subject	dynamic glass transition	en
dc.subject.classification	Polymer Science	en
dc.subject.other	INTERPENETRATING POLYMER NETWORKS	en
dc.subject.other	CHAIN-END GROUPS	en
dc.subject.other	SEGMENTED POLYURETHANES	en
dc.subject.other	GLASS-TRANSITION	en
dc.subject.other	DIELECTRIC-RELAXATION	en
dc.subject.other	ALPHA-RELAXATION	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	MORPHOLOGY	en
dc.subject.other	COPOLYMER	en
dc.subject.other	EXTENDERS	en
dc.title	Phase behavior and molecular mobility in polyurethane/styrene-acrylonitrile blends	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.1192	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.1192	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	Differential scanning calorimetry (DSC), thermally stimulated depolarization currents (TSDC) techniques, dielectric relaxation spectroscopy (DRS), and dynamic mechanical thermal analysis (DMTA), covering together a wide range of temperatures and frequencies, were employed to investigate molecular mobility and microphase separation in blends of crosslinked polyurethane (PUR) and styrene-acrylonitrile (SAN) copolymer, prepared by reactive blending with polymer polyols. The results by each technique indicate that the degree of microphase separation of PUR into hard-segment (HS) microdomains and soft-segment (SS) microphase increases on addition of SAN. The various techniques were critically compared to each other, with respect to their characteristic time and length scales, on the basis of activation diagrams (Arrhenius plots). The results show that for the dynamic glass transition of the PUR SS microphase the characteristic time scales at the same temperature are similar for DMTA, DSC, and TSDC and shorter for DRS. In terms of fragility, the PUR/SAN blends are classified as fragile systems. (C) 2001 John Wiley & Sons, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	JOURNAL OF APPLIED POLYMER SCIENCE	en
dc.identifier.doi	10.1002/app.1192	en
dc.identifier.isi	ISI:000167438700024	en
dc.identifier.volume	80	en
dc.identifier.issue	7	en
dc.identifier.spage	1071	en
dc.identifier.epage	1084	en