Thermal and dielectric studies of PEG/C/AST nanocomposites

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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 http://hdl.handle.net/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

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