Glass transition and molecular dynamics in poly(dimethylsiloxane)/silica nanocomposites

Fragiadakis, D; Pissis, P; Bokobza, L

dc.contributor.author	Fragiadakis, D	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Bokobza, L	en
dc.date.accessioned	2014-03-01T01:22:26Z
dc.date.available	2014-03-01T01:22:26Z
dc.date.issued	2005	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16572
dc.subject	Cooperativity	en
dc.subject	Glass transition	en
dc.subject	Nanocomposites	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Crystallization	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Electric currents	en
dc.subject.other	Glass transition	en
dc.subject.other	Molecular dynamics	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Surface chemistry	en
dc.subject.other	Synthesis (chemical)	en
dc.subject.other	Broadband dielectric relaxation spectroscopy	en
dc.subject.other	Depolarization currents	en
dc.subject.other	Filler interface	en
dc.subject.other	Poly(dimethylsiloxane)	en
dc.subject.other	Silica	en
dc.subject.other	polymer	en
dc.title	Glass transition and molecular dynamics in poly(dimethylsiloxane)/silica nanocomposites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2005.05.080	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2005.05.080	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	The molecular dynamics of a series of poly(dimethylsiloxane) networks filled with silica nanoparticles synthesized in situ was investigated using thermally stimulated depolarization currents, broadband dielectric relaxation spectroscopy and differential scanning calorimetry. The techniques used cover together a broad frequency range (10(-3)-10(9) Hz), thus allowing to gain a more complete understanding of the effects of the nanoparticles on the chain dynamics. In addition to the a relaxation associated with the glass transition of the polymer matrix, we observe in dielectric measurements a slower a relaxation which is assigned to polymer chains close to the polymer/filler interface whose mobility is restricted due to interactions with the filler surface. The thickness of the interfacial layer is estimated to be about 2.1-2.4 nm. Differential scanning calorimetry shows a change in the shape of the glass transition step, as well as a decrease in both the degree of crystallinity and the crystallization rate by the addition of silica. (c) 2005 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2005.05.080	en
dc.identifier.isi	ISI:000230714200020	en
dc.identifier.volume	46	en
dc.identifier.issue	16	en
dc.identifier.spage	6001	en
dc.identifier.epage	6008	en