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

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dc.contributor.author Valencia, Joaquin
dc.contributor.author Baselga Llidó, Juan
dc.contributor.author Fernández De Piérola, Inés
dc.date.accessioned 2017-11-28T12:20:42Z
dc.date.available 2017-11-28T12:20:42Z
dc.date.issued 2009-06
dc.identifier.bibliographicCitation Valencia, 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.
dc.identifier.issn 0887-6266
dc.identifier.uri http://hdl.handle.net/10016/25993
dc.description.abstract Several 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.
dc.description.sponsorship Financial support from DGI (Spain) under grant CTQ2007-61007/BQU is gratefully acknowledged.
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Wiley Periodicals, Inc.
dc.rights © Wiley, 2009
dc.subject.other Compression
dc.subject.other Crosslinking
dc.subject.other Degree of crosslinking
dc.subject.other Elastic modulus
dc.subject.other Hydrogels
dc.subject.other Ionic gels
dc.subject.other Modulus
dc.subject.other Networks
dc.subject.other Polyelectrolytes
dc.title Compression Elastic Modulus of Neutral, Ionic, and Amphoteric Hydrogels Based on N-Vinylimidazole
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1002/polb.21712
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. CTQ2007-61007/BQU
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1078
dc.identifier.publicationissue 11
dc.identifier.publicationlastpage 1087
dc.identifier.publicationtitle Journal of Polymer Science Part B: Polymer Physics
dc.identifier.publicationvolume 47
dc.identifier.uxxi AR/0000006608
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