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Water Sorption Characteristics of Poly(2-hydroxyethyl acrylate)/Silica Nanocomposite Hydrogels

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Water Sorption Characteristics of Poly(2-hydroxyethyl acrylate)/Silica Nanocomposite Hydrogels

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dc.contributor.author Pandis, Christos es_ES
dc.contributor.author Spanoudaki, Anna es_ES
dc.contributor.author Kyritsis, Apostolos es_ES
dc.contributor.author Pissis, Polycarpos es_ES
dc.contributor.author Rodríguez Hernández, José Carlos es_ES
dc.contributor.author Gómez Ribelles, José Luís es_ES
dc.contributor.author Monleón Pradas, Manuel es_ES
dc.date.accessioned 2016-05-17T07:34:17Z
dc.date.available 2016-05-17T07:34:17Z
dc.date.issued 2011-05-01
dc.identifier.issn 0887-6266
dc.identifier.uri http://hdl.handle.net/10251/64190
dc.description.abstract [EN] Water sorption in hydrogels based on nanocomposites of poly(2-hydroxyethyl acrylate) (PHEA) and silica, prepared by simultaneous polymerization and sol-gel process, were studied gravimetrically over wide ranges of silica content, both below and above the percolation threshold of about 15% wt for the formation of a continuous inorganic network interpenetrated with the organic network. Measurements were performed at room temperature from the vapor phase, both at equilibrium and dynamic, for selected values of water activity alpha(w) between 0 and 0.95, and from the liquid phase. In the nanocomposite hydrogels, the overall water uptake from the vapor phase is practically the same as in pure PHEA below the percolation threshold, whereas it is reduced above the percolation threshold, in particular at high alpha(w) values where swelling becomes significant. Water clustering sets in at around 14 vol % (10 wt %) of water independently of composition, whereas the mean value of water molecules in a cluster decreases at high silica contents. In immersion experiments water uptake decreases as silica content increases to the percolation threshold of about 15 wt % and is then almost independent of composition. A scheme is proposed, which explains these results in terms of the existence of micelles, where a number of hydrophilic hydroxy groups are linked together, and their disentaglement by immersion into water. Diffusion coefficients of water depend on water content and are reduced on addition of silica above the percolation threshold. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 657-668, 2011 es_ES
dc.description.sponsorship The research leading to these results has received partial support from the European Community's Seventh Framework Programme [FP7/2007-2013] under grant agreement n<SUP>o</SUP> 218331 NaPolyNet. J.L.G. Ribelles and M. M. Pradas acknowledge funding through the Regenerative Medicine Program agreement between the spanish government's Carlos III Health Institute and the Generalitat Valenciana. Materials used in this study were prepared in the context of project MAT2008-06434. en_EN
dc.language Inglés es_ES
dc.publisher Wiley es_ES
dc.relation.ispartof Journal of Polymer Science Part B: Polymer Physics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject diffusion es_ES
dc.subject hydrogels es_ES
dc.subject nanocomposites es_ES
dc.subject silica es_ES
dc.subject water sorption es_ES
dc.subject.classification MAQUINAS Y MOTORES TERMICOS es_ES
dc.subject.classification TERMODINAMICA APLICADA (UPV) es_ES
dc.title Water Sorption Characteristics of Poly(2-hydroxyethyl acrylate)/Silica Nanocomposite Hydrogels es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1002/polb.22225
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/218331/EU/Setting up research intensive clusters across the EU on characterization of polymer nanostructures/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//MAT2008-06434/ES/MATERIALES PARA REGENERACION NEURAL Y ANGIOGENESIS EN EL SISTEMA NERVIOSO CENTRAL/ es_ES
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Centro de Biomateriales e Ingeniería Tisular - Centre de Biomaterials i Enginyeria Tissular es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada es_ES
dc.description.bibliographicCitation Pandis, C.; Spanoudaki, A.; Kyritsis, A.; Pissis, P.; Rodríguez Hernández, JC.; Gómez Ribelles, JL.; Monleón Pradas, M. (2011). Water Sorption Characteristics of Poly(2-hydroxyethyl acrylate)/Silica Nanocomposite Hydrogels. Journal of Polymer Science Part B: Polymer Physics. 49(9):657-668. https://doi.org/10.1002/polb.22225 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1002/polb.22225 es_ES
dc.description.upvformatpinicio 657 es_ES
dc.description.upvformatpfin 668 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 49 es_ES
dc.description.issue 9 es_ES
dc.relation.senia 212294 es_ES
dc.contributor.funder European Commission
dc.contributor.funder Ministerio de Ciencia e Innovación


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