Polymer-water interactions in PAA hydrogels

Pissis, P; Kyritsis, A; Konsta, AA; Daoukaki, D

dc.contributor.author	Pissis, P	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Konsta, AA	en
dc.contributor.author	Daoukaki, D	en
dc.date.accessioned	2014-03-01T02:41:37Z
dc.date.available	2014-03-01T02:41:37Z
dc.date.issued	1999	en
dc.identifier.issn	09277757	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30566
dc.subject	Critical water contents	en
dc.subject	Hydration sites	en
dc.subject	Hydrogels dielectric relaxation spectroscopy	en
dc.subject	Plasticization	en
dc.subject.other	Activation energy	en
dc.subject.other	Hydration	en
dc.subject.other	Hydrogels	en
dc.subject.other	Polyacrylates	en
dc.subject.other	Spectroscopic analysis	en
dc.subject.other	Water	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Thermally stimulated depolarization current	en
dc.subject.other	Molecular dynamics	en
dc.subject.other	polyacrylamide	en
dc.subject.other	polymer	en
dc.subject.other	conference paper	en
dc.subject.other	dispersion	en
dc.subject.other	hydration	en
dc.subject.other	hydrogel	en
dc.subject.other	priority journal	en
dc.subject.other	spectroscopy	en
dc.subject.other	temperature	en
dc.subject.other	water content	en
dc.title	Polymer-water interactions in PAA hydrogels	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/S0927-7757(98)00314-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0927-7757(98)00314-8	en
heal.publicationDate	1999	en
heal.abstract	Polymer-water interactions in poyacrylamide (PAA) hydrogels were investigated by means of broad-band dielectric relaxation spectroscopy (DRS, 10-2-106Hz) and of thermally stimulated depolarization currents (TSDC) techniques (77-300K) at several hydration levels. The critical water content for the saturation of primary hydration sites was determined to be h(c)=0.15 (dry basis). For water contents h>h(c) plasticization effects dominate the behaviour of hydrogels. Two further critical water contents were determined from TSDC measurements at subzero temperatures related to freezing of water and to reorganization of water in the hydrogels, respectively. The activation energy of DC protonic conductivity was determined to be 0.8±0.1eV at h=0.25. Copyright (C) 1999 Elsevier Science B.V.Polymer-water interactions in poyacrylamide (PAA) hydrogels were investigated by means of broad-band dielectric relaxation spectroscopy (DRS, 10-2-106 Hz) and of thermally stimulated depolarization currents (TSDC) techniques (77-300 K) at several hydration levels. The critical water content for the saturation of primary hydration sites was determined to be hc=0.15 (dry basis). For water contents h>hc plasticization effects dominate the behavior of hydrogels. Two further critical water contents were determined from TSDC measurements at subzero temperatures related to freezing of water and to reorganization of water in the hydrogels, respectively. The activation energy of DC protonic conductivity was determined to be 0.8±0.1 eV at h=0.25.	en
heal.publisher	Elsevier Science Publishers B.V., Amsterdam, Netherlands	en
heal.journalName	Colloids and Surfaces A: Physicochemical and Engineering Aspects	en
dc.identifier.doi	10.1016/S0927-7757(98)00314-8	en
dc.identifier.volume	149	en
dc.identifier.issue	1-3	en
dc.identifier.spage	253	en
dc.identifier.epage	262	en