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Dielectric studies of phase morphology and molecular mobility in novel nanocomposites based on polyimide

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dc.contributor.author Pissis, P en
dc.contributor.author Kanapitsas, A en
dc.contributor.author Georgoussis, G en
dc.contributor.author Bershtein, VA en
dc.contributor.author Sysel, P en
dc.date.accessioned 2014-03-01T01:17:42Z
dc.date.available 2014-03-01T01:17:42Z
dc.date.issued 2002 en
dc.identifier.issn 0963-6935 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/14635
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-0036367615&partnerID=40&md5=882f8be280656b5950c56618cf6eb255 en
dc.subject.classification Materials Science, Composites en
dc.subject.other polyimide en
dc.subject.other resin en
dc.subject.other silicon dioxide en
dc.subject.other article en
dc.subject.other chemical bond en
dc.subject.other chemical structure en
dc.subject.other covalent bond en
dc.subject.other depolarization en
dc.subject.other dielectric constant en
dc.subject.other differential scanning calorimetry en
dc.subject.other hybrid en
dc.subject.other molecular dynamics en
dc.subject.other morphology en
dc.subject.other nanoparticle en
dc.subject.other phase transition en
dc.subject.other spectroscopy en
dc.subject.other temperature dependence en
dc.subject.other thermal stimulation en
dc.title Dielectric studies of phase morphology and molecular mobility in novel nanocomposites based on polyimide en
heal.type journalArticle en
heal.language English en
heal.publicationDate 2002 en
heal.abstract Broadband dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarisation currents (TSDC) techniques were employed to investigate and molecular mobility in relation to phase morphology in novel nanocomposites based on polyimide (PI). In addition to dielectric techniques, differential scanning calorimetry (DSC) and creep rate spectroscopy (CRS) provided information on phase transitions and relaxation behaviour of the composites. The systems investigated include nanophase-separated polyimide-silica (PI-SiO2) hybrid materials with covalent bonds between the components and rod-like polyimide (PIR) / flexible chain polyimide (PIF) molecular composites. The combination of several complementary techniques allowed to investigate the dynamic behaviour of PI in these systems in wide ranges of frequency and temperature. All the experiments indicated pronounced deviations from additivity in the dynamics of the composites. The results are discussed in terms of enhancement of small-scale motion due to loosened molecular packing of PI chains confined in nanovolumes and of reduction of large-scale chain mobility due to constraining effects and due to chemical bonds between the components. en
heal.publisher ADCOTEC LTD en
heal.journalName Advanced Composites Letters en
dc.identifier.isi ISI:000177598600001 en
dc.identifier.volume 11 en
dc.identifier.issue 2 en
dc.identifier.spage 49 en
dc.identifier.epage 58 en


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