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Dielectric studies of molecular mobility in hybrid polyimide-poly(dimethylsiloxane) networks

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dc.contributor.author Kripotou, S en
dc.contributor.author Pissis, P en
dc.contributor.author Bershtein, VA en
dc.contributor.author Sysel, P en
dc.contributor.author Hobzova, R en
dc.date.accessioned 2014-03-01T01:18:52Z
dc.date.available 2014-03-01T01:18:52Z
dc.date.issued 2003 en
dc.identifier.issn 0032-3861 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/15241
dc.subject Dielectric techniques en
dc.subject Hybrid networks en
dc.subject Molecular mobility en
dc.subject.classification Polymer Science en
dc.subject.other Dielectric liquids en
dc.subject.other Differential scanning calorimetry en
dc.subject.other Molecular dynamics en
dc.subject.other Nuclear magnetic resonance spectroscopy en
dc.subject.other Molecular mobility en
dc.subject.other Polyimides en
dc.subject.other dimeticone en
dc.subject.other glass en
dc.subject.other polyimide en
dc.subject.other molecular structure en
dc.subject.other article en
dc.subject.other chemical binding en
dc.subject.other crystallization en
dc.subject.other depolarization en
dc.subject.other dielectric constant en
dc.subject.other differential scanning calorimetry en
dc.subject.other isotherm en
dc.subject.other measurement en
dc.subject.other nuclear magnetic resonance en
dc.subject.other spectroscopy en
dc.subject.other thermal stimulation en
dc.title Dielectric studies of molecular mobility in hybrid polyimide-poly(dimethylsiloxane) networks en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0032-3861(03)00136-8 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0032-3861(03)00136-8 en
heal.language English en
heal.publicationDate 2003 en
heal.abstract Dielectric techniques, including broadband dielectric relaxation spectroscopy and thermally stimulated depolarization currents, and to a lesser extent differential scanning calorimetry and equilibrium water sorption :isotherm measurements, were employed to investigate molecular mobility in relation to morphology in polyimide-poly(dimethylsiloxane) hybrid networks (PI-PDMS). NMR measurements on the same samples had indicated that short PDMS chains with both ends chemically bound to the PI phase, form spherical domains of nanometer size. The local, secondary gamma relaxation of PI, the primary ot relaxation, associated to the glass transition of PDMS, and the interfacial Maxwell-Wagner-Sillars elaxation, related to the microphase-separated morphology, were studied in detail. The results are discussed in terms of nanoscale confinement of both components and of fixed chain ends of the PDMS component. These factors were found to affect considerably the magnitude of gamma and the alpha relaxations, whereas the time scale of the relaxations remains practically unchanged. (C) 2003 Elsevier Science Ltd. All rights reserved. en
heal.publisher ELSEVIER SCI LTD en
heal.journalName Polymer en
dc.identifier.doi 10.1016/S0032-3861(03)00136-8 en
dc.identifier.isi ISI:000182335400019 en
dc.identifier.volume 44 en
dc.identifier.issue 9 en
dc.identifier.spage 2781 en
dc.identifier.epage 2791 en


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