Thermal and dielectric studies of PEG/C/AST nanocomposites

Klonos, P; Kaprinis, S; Zarko, VI; Peoglos, V; Pakhlov, EM; Pissis, P; Gun'ko, VM

dc.contributor.author	Klonos, P	en
dc.contributor.author	Kaprinis, S	en
dc.contributor.author	Zarko, VI	en
dc.contributor.author	Peoglos, V	en
dc.contributor.author	Pakhlov, EM	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Gun'ko, VM	en
dc.date.accessioned	2014-03-01T11:47:19Z
dc.date.available	2014-03-01T11:47:19Z
dc.date.issued	2012	en
dc.identifier.issn	00218995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/38124
dc.subject	Activation energy	en
dc.subject	Calorimetry	en
dc.subject	Composites	en
dc.subject	Interfaces	en
dc.subject	Relaxation	en
dc.title	Thermal and dielectric studies of PEG/C/AST nanocomposites	en
heal.type	other	en
heal.identifier.primary	10.1002/app.37956	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.37956	en
heal.publicationDate	2012	en
heal.abstract	C/AST/PEG nanocomposites with fumed AST (89 wt % Al2O3, 10 wt % SiO2, 1 wt % TiO2), activated carbon, and poly(ethylene glycol), PEG, were prepared in a wide range of PEG and C/AST (1: 9) contents. Thermal transitions (mainly in a PEG phase) were investigated by differential scanning calorimetry. The dynamic behavior was investigated by thermally stimulated depolarization current and dielectric relaxation spectroscopy. The PEG crystallinity degree decreases in the nanocomposites, in particular at CPEG ≤ 40 wt %. A significant fraction of amorphous polymer is immobilized at a filler surface making no contribution to the glass transition, whereas the rest exhibits a lower glass transition temperature, when compared with bulk polymer, because of loosened molecular packing of the chains. Several relaxations arising from the polymer matrix, the filler, and their combination were identified and analyzed. The segmental α-relaxation of the PEG matrix was found to become faster in the nanocomposites. © 2012 Wiley Periodicals, Inc.	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.37956	en