Broadband dielectric relaxation spectroscopy in polymer nanocomposites

Pissis, P; Fragiadakis, D; Kanapitsas, A; Delides, K

dc.contributor.author	Pissis, P	en
dc.contributor.author	Fragiadakis, D	en
dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Delides, K	en
dc.date.accessioned	2014-03-01T02:45:10Z
dc.date.available	2014-03-01T02:45:10Z
dc.date.issued	2008	en
dc.identifier.issn	10221360	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32177
dc.subject	Dielectric spectroscopy	en
dc.subject	Glass transition	en
dc.subject	Polymer nanocomposites	en
dc.subject	Segmental dynamics	en
dc.subject.other	ABS resins	en
dc.subject.other	Butadiene	en
dc.subject.other	Clay minerals	en
dc.subject.other	Conducting polymers	en
dc.subject.other	Diamond deposits	en
dc.subject.other	Diamonds	en
dc.subject.other	Dielectric devices	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Dynamics	en
dc.subject.other	Epoxy resins	en
dc.subject.other	Free volume	en
dc.subject.other	Glass	en
dc.subject.other	Glass transition	en
dc.subject.other	Laser interferometry	en
dc.subject.other	Metallic matrix composites	en
dc.subject.other	Molecular dynamics	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanoparticles	en
dc.subject.other	Nanostructures	en
dc.subject.other	Organic polymers	en
dc.subject.other	Polyimides	en
dc.subject.other	Polymer matrix composites	en
dc.subject.other	Polymers	en
dc.subject.other	Quantum chemistry	en
dc.subject.other	Resins	en
dc.subject.other	Silica	en
dc.subject.other	Styrene	en
dc.subject.other	Broad frequency ranges	en
dc.subject.other	Broadband dielectric relaxation spectroscopies	en
dc.subject.other	Carbon nanoparticles	en
dc.subject.other	Diamond nanoparticles	en
dc.subject.other	Dielectric behaviors	en
dc.subject.other	Frequency domains	en
dc.subject.other	Geometrical confinements	en
dc.subject.other	Inorganic nanoparticles	en
dc.subject.other	Molecular mobilities	en
dc.subject.other	Molecular packings	en
dc.subject.other	Polymer nanocomposites	en
dc.subject.other	Polymeric nanocomposites	en
dc.subject.other	Resin matrixes	en
dc.subject.other	Segmental dynamics	en
dc.subject.other	Silica nanocomposites	en
dc.subject.other	Smectite clays	en
dc.subject.other	Structure and morphologies	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	Nanostructured materials	en
dc.title	Broadband dielectric relaxation spectroscopy in polymer nanocomposites	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1002/masy.200850502	en
heal.identifier.secondary	http://dx.doi.org/10.1002/masy.200850502	en
heal.publicationDate	2008	en
heal.abstract	Dielectric spectroscopy in the frequency domain and thermally stimulated depolarization currents techniques, covering together a broad frequency range (10-4-109 Hz), were employed to investigate molecular dynamics in relation to structure and morphology in polymeric nanocomposites. Several systems were investigated, three of them with the same epoxy resin matrix and different inclusions (modified smectite clay, conducting carbon nanoparticles and diamond nanoparticles) and two with silica nanofiller (styrene-butadiene rubber/silica and polyimide/ silica nanocomposites). Special attention was paid to the investigation of segmental dynamics associated with the glass transition of the polymer matrix, in combination also with differential scanning calorimetry measurements. Effects of nanoparticles on local (secondary) relaxations and on the overall dielectric behavior were, however, also investigated. Several interesting results were obtained and discussed for each of the particular systems. Two opposite effects seem to be common to the nanocomposites studied and dominate their behavior: (i) immobilization/reduction of mobility of a fraction of the chains at the interface to the inorganic nanoparticles, due to chemical or physical bonds with the particles, and (2) loosened molecular packing of the chains, due to tethering and geometrical confinement, resulting in an increase of free volume and of molecular mobility. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.	en
heal.journalName	Macromolecular Symposia	en
dc.identifier.doi	10.1002/masy.200850502	en
dc.identifier.volume	265	en
dc.identifier.issue	1	en
dc.identifier.spage	12	en
dc.identifier.epage	20	en