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DIELECTRIC-RELAXATION SPECTROSCOPY IN POLY(HYDROXYETHYL ACRYLATES)/WATER HYDROGELS

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dc.contributor.author KYRITSIS, A en
dc.contributor.author PISSIS, P en
dc.contributor.author GRAMMATIKAKIS, J en
dc.date.accessioned 2014-03-01T01:10:55Z
dc.date.available 2014-03-01T01:10:55Z
dc.date.issued 1995 en
dc.identifier.issn 0887-6266 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/11496
dc.subject POLY(HYDROXYETHYL ACRYLATE) HYDROGELS en
dc.subject DIELECTRIC RELAXATION en
dc.subject CONDUCTIVITY, COMPLEX IMPEDANCE AND ELECTRIC MODULUS en
dc.subject ELECTRODE POLARIZATION en
dc.subject FRAGILITY en
dc.subject.classification Polymer Science en
dc.subject.other VITREOUS IONIC CONDUCTORS en
dc.subject.other POLY(2-HYDROXYETHYL METHACRYLATE) en
dc.subject.other CONDUCTIVITY RELAXATIONS en
dc.subject.other ELECTRICAL RELAXATION en
dc.subject.other LIQUIDS en
dc.subject.other WATER en
dc.subject.other POLYMERS en
dc.subject.other SOLIDS en
dc.subject.other TRANSITION en
dc.subject.other DEPENDENCE en
dc.title DIELECTRIC-RELAXATION SPECTROSCOPY IN POLY(HYDROXYETHYL ACRYLATES)/WATER HYDROGELS en
heal.type journalArticle en
heal.identifier.primary 10.1002/polb.1995.090331205 en
heal.identifier.secondary http://dx.doi.org/10.1002/polb.1995.090331205 en
heal.language English en
heal.publicationDate 1995 en
heal.abstract The electrical and dielectric properties of poly(hydroxyethyl acrylate), PHEA, hydrogels were studied by means of dielectric relaxation spectroscopy in wide ranges of frequencies (5-2 X 10(9) Hz), temperatures (173-363 K) and water contents (0.065-0.46, g of water per gram of dry material). The secondary dipolar mechanisms (gamma and beta(sw)) and the dc conductivity mechanism were studied in detail by analyzing the dielectric susceptibility data within the complex permittivity formalism, the modulus formalism, and the complex impedance formalism. For both mechanisms molecular mobility was found to increase with increasing temperature or increasing water content (T-f-h superposition principle). The energy parameters and the shape parameters of the response were determined for both mechanisms at several water contents and temperatures. The temperature dependence of de conductivity was found to change from Vogel-Tamman-Fulcher (VTF) type to Arrhenius type at water contents of ca. 0.30. At water contents lower than about 0.30 the hydrogels are homogeneous whereas at higher water contents a separate water phase appears. In terms of the strong/fragile classification scheme our results suggest that the PHEA hydrogels are fragile systems. (C) 1995 John Wiley and Sons, Inc. en
heal.publisher JOHN WILEY & SONS INC en
heal.journalName JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS en
dc.identifier.doi 10.1002/polb.1995.090331205 en
dc.identifier.isi ISI:A1995RP02600005 en
dc.identifier.volume 33 en
dc.identifier.issue 12 en
dc.identifier.spage 1737 en
dc.identifier.epage 1750 en


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