Structure-property relationships in brittle polymer networks modified by flexible cross-links

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dc.contributor.author Kripotou, S en
dc.contributor.author Pissis, P en
dc.contributor.author Kontou, E en
dc.contributor.author Fainleib, AM en
dc.contributor.author Grygoryeva, O en
dc.contributor.author Bey, I en
dc.date.accessioned 2014-03-01T01:25:12Z
dc.date.available 2014-03-01T01:25:12Z
dc.date.issued 2006 en
dc.identifier.issn 0137-1339 en
dc.identifier.uri http://hdl.handle.net/123456789/17596
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-33745784175&partnerID=40&md5=2058d6cd360b0fffccee60aa5e323c5d en
dc.subject Dielectric spectroscopy en
dc.subject Main α relaxation en
dc.subject Modified polycyanurate network en
dc.subject Polyoxytetramethylene glycol (PTMG) en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.other Crosslinking en
dc.subject.other Crystalline materials en
dc.subject.other Dielectric properties en
dc.subject.other Glass transition en
dc.subject.other Morphology en
dc.subject.other Dielectric spectroscopy en
dc.subject.other Main α relaxation en
dc.subject.other Modified polycyanurate network en
dc.subject.other Polyoxytetramethylene glycol (PTMG) en
dc.subject.other Polymers en
dc.title Structure-property relationships in brittle polymer networks modified by flexible cross-links en
heal.type journalArticle en
heal.language English en
heal.publicationDate 2006 en
heal.abstract Hybrid polycyanurate/polyoxytetramethylene glycol (PCN/PTMG) networks were prepared from PCN and PTMG (molar mass 1.000 g/mol) with 10, 20, 30 and 40 wt. % PTMG. The degree of incorporation of PTMG into the PCN network was determined by gel fraction measurements. Earlier morphological and thermal transition studies indicated a non-crystalline structure, considerable nanostructural heterogeneity and a wide dispersion of glass transition temperatures of the hybrid networks. The present paper reports on a continued investigation of structure-property relationships and employ dielectric techniques to focus on molecular dynamics. Two secondary relaxations of PCN, one secondary relaxation of PTMG and a single, broad a relaxation (dynamic glass transition) were detected in the hybrids. The a relaxation was studied in detail over wide ranges of temperature and frequency. The results were system-atically analyzed in terms of time scale, relaxation strength and shape of the response, and are discussed in terms of plasticization, presence of nanostructural heterogeneities (composition fluctuations) and hybridization. A distinctly different behaviour, observed for the hybrid with 30% PTMG, is explained in terms of a more pronounced nanoheterogeneous structure. Finally, stress-strain measurements were performed and their results are discussed in terms of structure and molecular dynamics. en
heal.journalName Materials Science- Poland en
dc.identifier.isi ISI:000238978200007 en
dc.identifier.volume 24 en
dc.identifier.issue 2 II en
dc.identifier.spage 477 en
dc.identifier.epage 492 en

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