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Compression Elastic Modulus of Neutral, Ionic, and Amphoteric Hydrogels Based on N-Vinylimidazole

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Polímeros y Compositeses
dc.contributor.authorValencia, Joaquin
dc.contributor.authorBaselga Llidó, Juan
dc.contributor.authorFernández de Piérola, Inés
dc.date.accessioned2017-11-28T12:20:42Z
dc.date.available2017-11-28T12:20:42Z
dc.date.issued2009-06
dc.description.abstractSeveral hydrogels of N-vinylimidazole and sodium styrenesulfonate have been prepared by radical cross-linking copolymerization in aqueous solution, using N,N′-methylene-bisacrylamide as crosslinker. Depending on composition, these hydrogels were neutral, amphoteric, cationic or anionic. Compression-strain measurements were performed on samples as-synthesized and swollen in deionized water or in acid aqueous solutions, with and without salt. It was thus found that the cross-linking densities determined by compression measurements on as-synthesized samples are in good accordance with those calculated by means of the model of polymer networks with pendant vinyl groups. A non-Gaussian parameter (β) was introduced to explain that the elastic moduli (G) of samples swollen at equilibrium are larger than predicted by the Gaussian model. The β values of the neutral or ionized systems increase with swelling and fall into a single curve, which denotes a common behavior. Swelling has two opposite effects on G; on the one hand G decreases because the polymer volume fraction diminish and the system shifts from the affine limit to the phantom one; on the other, β increases and contributes to increasing G. The balance of those two opposite effects determines the variation of G with swelling. The possible contribution of ionic crosslinks to ᶹₑ for the polyampholyte and for the polycation wearing divalent counteranions was discussed. A peculiar system is poly(sodium styrenesulfonate), whose cross-linking density is much lower than expected.en
dc.description.sponsorshipFinancial support from DGI (Spain) under grant CTQ2007-61007/BQU is gratefully acknowledged.en
dc.format.extent10
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationValencia, J., Baselga, J. & Piérola, I. F. (2009). Compression elastic modulus of neutral, ionic, and amphoteric hydrogels based on N-vinylimidazole. Journal of Polymer Science Part B: Polymer Physics, 47 (11), pp. 1078–1087.en
dc.identifier.doihttps://doi.org/10.1002/polb.21712
dc.identifier.issn0887-6266
dc.identifier.publicationfirstpage1078
dc.identifier.publicationissue11
dc.identifier.publicationlastpage1087
dc.identifier.publicationtitleJournal of Polymer Science Part B: Polymer Physicsen
dc.identifier.publicationvolume47
dc.identifier.urihttps://hdl.handle.net/10016/25993
dc.identifier.uxxiAR/0000006608
dc.language.isoeng
dc.publisherWiley Periodicals, Inc.en
dc.relation.projectIDGobierno de España. CTQ2007-61007/BQUes
dc.rights© Wiley, 2009
dc.rights.accessRightsopen access
dc.subject.ecienciaMaterialeses
dc.subject.ecienciaQuímicaes
dc.subject.otherCompressionen
dc.subject.otherCrosslinkingen
dc.subject.otherDegree of crosslinkingen
dc.subject.otherElastic modulusen
dc.subject.otherHydrogelsen
dc.subject.otherIonic gelsen
dc.subject.otherModulusen
dc.subject.otherNetworksen
dc.subject.otherPolyelectrolytesen
dc.titleCompression Elastic Modulus of Neutral, Ionic, and Amphoteric Hydrogels Based on N-Vinylimidazoleen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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