Comparative studies on effects of silica and titania nanoparticles on crystallization and complex segmental dynamics in poly(dimethylsiloxane)

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

dc.contributor.author	Klonos, P	en
dc.contributor.author	Panagopoulou, A	en
dc.contributor.author	Bokobza, L	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Peoglos, V	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:33:02Z
dc.date.available	2014-03-01T01:33:02Z
dc.date.issued	2010	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20281
dc.subject	Poly(dimethylsiloxane) nanocomposites	en
dc.subject	Polymer crystallization	en
dc.subject	Segmental dynamics	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Broadband dielectric relaxation spectroscopy	en
dc.subject.other	Bulk amorphous	en
dc.subject.other	Comparative studies	en
dc.subject.other	Crystal region	en
dc.subject.other	Crystallinities	en
dc.subject.other	In-situ synthesized	en
dc.subject.other	Interaction length	en
dc.subject.other	Interfacial layer	en
dc.subject.other	Nanoparticle surface	en
dc.subject.other	Poly(dimethylsiloxane) nanocomposites	en
dc.subject.other	Polydimethylsiloxane networks	en
dc.subject.other	Polymer chains	en
dc.subject.other	Polymer crystallization	en
dc.subject.other	Segmental dynamics	en
dc.subject.other	Segmental relaxation	en
dc.subject.other	Strong interaction	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	Titania	en
dc.subject.other	Titania nanoparticles	en
dc.subject.other	Well-dispersed	en
dc.subject.other	Crystallization	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Dynamics	en
dc.subject.other	Glass	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanoparticles	en
dc.subject.other	Polymers	en
dc.subject.other	Silica	en
dc.subject.other	Spectroscopy	en
dc.subject.other	Titanium dioxide	en
dc.subject.other	Glass transition	en
dc.title	Comparative studies on effects of silica and titania nanoparticles on crystallization and complex segmental dynamics in poly(dimethylsiloxane)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2010.09.054	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2010.09.054	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	Effects of in situ synthesized silica and titania nanoparticles, 5 and 20-40 nm in diameter, respectively, on glass transition and segmental dynamics of poly(dimethylsiloxane) networks were studied by employing differential scanning calorimetry, thermally stimulated depolarization currents and broadband dielectric relaxation spectroscopy techniques. Strong interactions between the well dispersed fillers and the polymer suppress crystallinity and affect significantly the evolution of the glass transition in the nanocomposites. Next to the alpha relaxation associated with the glass transition of the bulk amorphous polymer fraction, two more segmental relaxations were recorded, originating from polymer chains restricted between condensed crystal regions (alpha(c)-relaxation) and the semi-bound polymer in an interfacial layer with strongly reduced mobility due to interactions with hydroxyls on the nanoparticle surface (alpha' relaxation), respectively. Interactions with the polymer were found to be stronger in the case of Mania than silica, leading to an estimated interaction length of around 2 nm for silica and at least double for titania nanocomposites. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2010.09.054	en
dc.identifier.isi	ISI:000284029200027	en
dc.identifier.volume	51	en
dc.identifier.issue	23	en
dc.identifier.spage	5490	en
dc.identifier.epage	5499	en