Network defects in polyacrylamide gels

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Show simple item record Baselga Llidó, Juan Llorente Muga, Amaia Hernández-Fuentes, I. Fernández de Piérola, Inés 2017-11-09T11:41:49Z 2017-11-09T11:41:49Z 1989-01
dc.identifier.bibliographicCitation J. Baselga, M. A. Llorente, J. L. Nieto, I. Hernández-Fuentes, I. F. Piérola (1989). Network defects in polyacrylamide gels. European Polymer Journal, 25 (5), pp. 471-475.
dc.identifier.issn 0014-3057
dc.description.abstract The weight conversion at the gel point (αGᵂ) was determined by the gas bubble method in two sets of polyacrylamide (PAA) gels crosslinked with N,N′-methylene-bisacrylamide (BA). αGᵂ remained practically constant when the crosslinker ratio was C = 10% (w/w) and the total concentration of comonomers in the feed ranged from CT = 5 to 10 g/100 ml. When CT was kept constant at 5 g/100 ml and C changed from 0 to 25% (w/w), αGᵂ showed a minimum at C = 7%. By comparing the experimental values of αGᵂ with those calculated for an ideal network, it was concluded that the crosslinking efficiency of BA is very low. The dependence on C of αGᵂ and other properties like the elastic phantom modulus, |ƒₚₕ*|, and the polymer volume fraction at swelling equilibrium, v₂ₛo, was explained in terms of the formation of network defects: the formation of BA sequences longer than unity and that of intramolecular cycles both have an increasing contribution at C > 7% but can be neglected at lower values of C.
dc.description.sponsorship This work has been supported by a grant from CAICYT No. GG85-0013. The authors thank Dr A. Horta and Dr J. J. Freire for many helpful discussions.
dc.format.extent 5
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Pergamon Press
dc.rights © Pergamon Press, 1989 © Elsevier
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.title Network defects in polyacrylamide gels
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 471
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 475
dc.identifier.publicationtitle European Polymer Journal
dc.identifier.publicationvolume 25
dc.identifier.uxxi AR/0000010929
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