Thermal transitions and dynamics in nanocomposite hydrogels

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dc.contributor.author Kyritsis, A en
dc.contributor.author Spanoudaki, A en
dc.contributor.author Pandis, C en
dc.contributor.author Hartmann, L en
dc.contributor.author Pelster, R en
dc.contributor.author Shinyashiki, N en
dc.contributor.author Rodriguez Hernandez, JC en
dc.contributor.author Gomez Ribelles, JL en
dc.contributor.author Monleon Pradas, M en
dc.contributor.author Pissis, P en
dc.date.accessioned 2014-03-01T11:46:35Z
dc.date.available 2014-03-01T11:46:35Z
dc.date.issued 2011 en
dc.identifier.issn 13886150 en
dc.identifier.uri http://hdl.handle.net/123456789/37957
dc.subject Electrical conductivity en
dc.subject Glass transition en
dc.subject Poly(hydroxyethyl acrylate-co-ethyl acrylate)/silica hydrogels en
dc.subject Segmental dynamics en
dc.title Thermal transitions and dynamics in nanocomposite hydrogels en
heal.type other en
heal.identifier.primary 10.1007/s10973-011-2093-5 en
heal.identifier.secondary http://dx.doi.org/10.1007/s10973-011-2093-5 en
heal.publicationDate 2011 en
heal.abstract Hydrogels based on nanocomposites of statistical poly(hydroxyethyl acrylate-co-ethyl acrylate) and silica, prepared by simultaneous copolymerization and generation of silica nanoparticles by sol-gel process at various copolymer compositions and silica contents, characterized by a fine dispersion of filler, were investigated with respect to glass transition and polymer dynamics by dielectric techniques. These include thermally stimulated depolarization currents and dielectric relaxation spectroscopy, covering together broad ranges of frequency and temperature. In addition, equilibrium water sorption isotherms were recorded at room temperature (25 °C). Special attention was paid to the investigation of effects of silica on glass transition, polymer dynamics (secondary γ and βsw relaxations and segmental α relaxation), and electrical conductivity in the dry systems (xerogels) and in the hydrogels at various levels of relative humidity/water content. An overall reduction of molecular mobility is observed in the nanocomposite xerogels, in particular at high silica contents. Analysis of the results and comparison with previous work on similar systems enable to discuss this reduction of molecular mobility in terms of constraints to polymeric motion imposed by interfacial polymer-filler interactions and by the formation of a continuous silica network interpenetrated with the polymer network at filler contents higher than about 15 wt%. © 2011 Akadémiai Kiadó, Budapest, Hungary. en
heal.journalName Journal of Thermal Analysis and Calorimetry en
dc.identifier.doi 10.1007/s10973-011-2093-5 en
dc.identifier.spage 1 en
dc.identifier.epage 12 en

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