Interfacial effects in polymer nanocomposites studied by dielectric and thermal techniques

Klonos, P; Pandis, C; Kripotou, S; Kyritsis, A; Pissis, P

dc.contributor.author	Klonos, P	en
dc.contributor.author	Pandis, C	en
dc.contributor.author	Kripotou, S	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T02:09:21Z
dc.date.available	2014-03-01T02:09:21Z
dc.date.issued	2012	en
dc.identifier.issn	10709878	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29829
dc.subject	dielectric spectroscopy	en
dc.subject	glass transition	en
dc.subject	interfacial interactions	en
dc.subject	nanoparticles	en
dc.subject	Polydimethylsiloxane	en
dc.subject	polymer crystallization	en
dc.subject	segmental dynamics	en
dc.subject	silica	en
dc.subject	titania	en
dc.subject.other	Amorphous phase	en
dc.subject.other	Dielectric techniques	en
dc.subject.other	Double effects	en
dc.subject.other	Hydrogen bonding interactions	en
dc.subject.other	In-situ synthesized	en
dc.subject.other	Inorganic particles	en
dc.subject.other	Interfacial effects	en
dc.subject.other	Interfacial interaction	en
dc.subject.other	Interfacial layer	en
dc.subject.other	Modified polymer	en
dc.subject.other	Polydimethylsiloxane PDMS	en
dc.subject.other	Polymer chains	en
dc.subject.other	Polymer crystallization	en
dc.subject.other	Polymer mobility	en
dc.subject.other	Polymer nanocomposite	en
dc.subject.other	Segmental dynamics	en
dc.subject.other	Silica nanoparticles	en
dc.subject.other	Thermal techniques	en
dc.subject.other	Titania	en
dc.subject.other	Titania nanoparticles	en
dc.subject.other	Well-dispersed	en
dc.subject.other	Amorphous materials	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Dynamics	en
dc.subject.other	Filled polymers	en
dc.subject.other	Glass transition	en
dc.subject.other	Hydrogen	en
dc.subject.other	Hydrogen bonds	en
dc.subject.other	Microchannels	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanoparticles	en
dc.subject.other	Polydimethylsiloxane	en
dc.subject.other	Silica	en
dc.subject.other	Silicones	en
dc.subject.other	Titanium dioxide	en
dc.subject.other	Polymers	en
dc.title	Interfacial effects in polymer nanocomposites studied by dielectric and thermal techniques	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/TDEI.2012.6260002	en
heal.identifier.secondary	http://dx.doi.org/10.1109/TDEI.2012.6260002	en
heal.identifier.secondary	6260002	en
heal.publicationDate	2012	en
heal.abstract	Effects of interfaces and interphases in polydimethylsiloxane (PDMS) matrices with in situ synthesized titania (20 - 40 nm, in diameter) and silica nanoparticles (∼5 nm), were studied employing dielectric and thermal techniques. The presence of the well dispersed inorganic particles and the hydrogen polymer - filler bonding result in a double effect on polymer mobility: suppression of crystallization and immobilization in a layer of a few nm around the particles. The effects were stronger in the case of titania nanoparticles, in consistency with stronger hydrogen bonding interactions, comparing to silica. Various contributions to the glass transition were recorded by both thermal and dielectric techniques, corresponding to bulk and modified polymer dynamics. The modified mobility originates from the restriction of polymer chains within the PDMS crystals and in an interafacial rigid amorphous PDMS layer around the nanoparticles. The thickness of the interfacial layer was estimated to 3-5 nm for titania and ∼2 nm for silica. The mobile amorphous phase fraction giving rise to the glass transition was found to be nearly constant in the nanocomposites. The results were confirmed by employing various thermal (crystallization) treatments of the samples. © 1994-2012 IEEE.	en
heal.journalName	IEEE Transactions on Dielectrics and Electrical Insulation	en
dc.identifier.doi	10.1109/TDEI.2012.6260002	en
dc.identifier.volume	19	en
dc.identifier.issue	4	en
dc.identifier.spage	1283	en
dc.identifier.epage	1290	en