Dielectric studies of segmental dynamics in poly(dimethylsiloxane)/titania nanocomposites

Klonos, P; Panagopoulou, A; Kyritsis, A; Bokobza, L; Pissis, P

dc.contributor.author	Klonos, P	en
dc.contributor.author	Panagopoulou, A	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Bokobza, L	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T02:47:20Z
dc.date.available	2014-03-01T02:47:20Z
dc.date.issued	2011	en
dc.identifier.issn	0022-3093	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33083
dc.subject	Dielectric spectroscopy	en
dc.subject	Nanocomposites	en
dc.subject	Poly(dimethylsiloxane)	en
dc.subject	Segmental dynamics	en
dc.subject	Titania	en
dc.subject.classification	Materials Science, Ceramics	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Amorphous polymers	en
dc.subject.other	Broad frequency range	en
dc.subject.other	Crystal region	en
dc.subject.other	Crystallinities	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Dielectric studies	en
dc.subject.other	Filler addition	en
dc.subject.other	In-situ synthesized	en
dc.subject.other	Interfacial interaction	en
dc.subject.other	Interfacial layer	en
dc.subject.other	Nanoparticle surface	en
dc.subject.other	Polymer chains	en
dc.subject.other	Polymer networks	en
dc.subject.other	Segmental dynamics	en
dc.subject.other	Segmental relaxation	en
dc.subject.other	Sol-gel technique	en
dc.subject.other	Temperature development	en
dc.subject.other	Thermal protocol	en
dc.subject.other	Thermal transitions	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	TiO	en
dc.subject.other	Titania	en
dc.subject.other	Titania nanoparticles	en
dc.subject.other	Well-dispersed	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	Fillers	en
dc.subject.other	Glass	en
dc.subject.other	Glass transition	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanoparticles	en
dc.subject.other	Polymers	en
dc.subject.other	Titanium dioxide	en
dc.title	Dielectric studies of segmental dynamics in poly(dimethylsiloxane)/titania nanocomposites	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.jnoncrysol.2010.06.058	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jnoncrysol.2010.06.058	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Differential scanning calorimetry, thermally stimulated depolarization currents and dielectric relaxation spectroscopy techniques, covering together a broad frequency range of 10(-4) to 10(6) Hz, were employed to investigate the effects of in situ synthesized titania nanoparticles on thermal transitions, segmental dynamics and interfacial interactions in poly(dimethylsiloxane)/titania nanocomposites. Titania particles (TiO2, 2040 nm in diameter) were prepared and well dispersed into the polymer network through sol-gel technique, aiming at stable and mechanically reinforced systems. The interactions between polymer and fillers were found to be strong, supressing crystallinity and affecting the temperature development of the glass transition. The segmental relaxation associated with the glass transition consists of three contributions, arising, in the order of decreasing mobility, from the bulk (unaffected) amorphous polymer fraction (alpha relaxation), from polymer chains restricted between condensed crystal regions (alpha(c) relaxation), and from the semi-bound polymer in an interfacial layer with strongly reduced mobility due to interactions with hydroxyls on the nanoparticle surface (alpha relaxation). The thickness of the interfacial layer was estimated to be in the range of 3-5 nm. Measurements using different thermal protocols proved very effective in analyzing the origin of each relaxation and the respective effects of filler addition. (C) 2010 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Non-Crystalline Solids	en
dc.identifier.doi	10.1016/j.jnoncrysol.2010.06.058	en
dc.identifier.isi	ISI:000287640800067	en
dc.identifier.volume	357	en
dc.identifier.issue	2	en
dc.identifier.spage	610	en
dc.identifier.epage	614	en