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

Kripotou, S; Pissis, P; Bershtein, VA; Sysel, P; Hobzova, R

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