Dielectric relaxation spectroscopy in crosslinked polyurethanes based on polymer polyols

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dc.contributor.author Kanapitsas, A en
dc.contributor.author Pissis, P en
dc.date.accessioned 2014-03-01T01:15:33Z
dc.date.available 2014-03-01T01:15:33Z
dc.date.issued 2000 en
dc.identifier.issn 0014-3057 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/13580
dc.subject Dielectric Relaxation en
dc.subject Differential Scanning Calorimetry en
dc.subject Glass Transition en
dc.subject Glass Transition Temperature en
dc.subject Sampling Technique en
dc.subject.classification Polymer Science en
dc.subject.other CHAIN-END GROUPS en
dc.subject.other BLOCK COPOLYMERS en
dc.subject.other MICROPHASE SEPARATION en
dc.subject.other GLASS-TRANSITION en
dc.subject.other ELASTOMERS en
dc.subject.other MORPHOLOGY en
dc.subject.other EXTENDERS en
dc.subject.other DSC en
dc.title Dielectric relaxation spectroscopy in crosslinked polyurethanes based on polymer polyols en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0014-3057(99)00167-6 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0014-3057(99)00167-6 en
heal.language English en
heal.publicationDate 2000 en
heal.abstract This work deals with molecular mobility and microphase separation studies in blends of crosslinked polyurethanes and styrene-acrylonitrile (SAN), prepared by reactive blending, by means of differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DRS) techniques. The DRS techniques employed include broadband ac techniques, 10(-2)-10(6) Hz, and thermally stimulated depolarization currents (TSDC) techniques, -180 to 30 degrees C. The results suggest, in agreement with each other by the different techniques, that SAN promotes the microphase separation between hard segment (HS) microdomains and soft segment (SS) microphase due to SAN-MS interactions, whereas SAN-SS interactions are weak. TSDC thermal sampling techniques show that a compensation law holds for the alpha relaxation associated with the glass transition of the SS microphase, with the compensation temperature being very close to the glass transition temperature. Analysis of the alpha relaxation in terms of fragility indicates that the systems under investigation are fragile. (C) 2000 Elsevier Science Ltd. All rights reserved. en
dc.identifier.doi 10.1016/S0014-3057(99)00167-6 en
dc.identifier.isi ISI:000085986000018 en
dc.identifier.volume 36 en
dc.identifier.issue 6 en
dc.identifier.spage 1241 en
dc.identifier.epage 1250 en

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