Interaction of acrylic-maleic copolymers with H+, Na+, Mg2+ and Ca2+: Thermodynamic parameters and their dependence on medium

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dc.contributor.authorBretti, Clemente
dc.contributor.authorCrea, Francesco
dc.contributor.authorRey Castro, Carlos
dc.contributor.authorSammartano, Silvio
dc.date.accessioned2016-11-29T11:40:29Z
dc.date.embargoEndDate2025-01-01
dc.date.issued2005
dc.description.abstractThermodynamic parameters for the interaction of two acrylic-maleic copolymers (MW = 3 and 70 kDa) with H+, Na+, Mg2+ and Ca2+ were obtained from potentiometric and calorimetric measurements. Apparent protonation constants were expressed as a function of a (dissociation degree) using the three parameter model proposed by Ho¨gfeldt and the formation constants of Na+, Mg2+ and Ca2+ complexes were calculated from the differences in protonation constants in the different ionic media. The salt effects on protonation were interpreted in terms of both activity coeffi- cient variations and cation complex formation. Enthalpy changes for protonation, obtained by direct calorimetry (always quite low, the stabilization being mainly of entropic nature), were also expressed as a function of a and I using empirical equations. The formation constants obtained for alkali and alkaline earth metal complexes are quite low for Na+ species (depending on a and on ionic strength, we always found K < 10 L mol 1 ), and fairly high for Mg2+ and Ca2+ species, ML and ML2ca_ES
dc.description.sponsorshipWe thank Università of Messina (PRA) for financial support and Ministerio de Educación, Cultura y Deporte (Spain) for the FPU fellowship of C.R.C.ca_ES
dc.identifier.doihttps://doi.org/10.1016/j.reactfunctpolym.2005.07.005
dc.identifier.idgrec010586
dc.identifier.issn1381-5148
dc.identifier.urihttp://hdl.handle.net/10459.1/58687
dc.language.isoengca_ES
dc.publisherElsevierca_ES
dc.relation.isformatofReproducció del document publicat a https://doi.org/10.1016/j.reactfunctpolym.2005.07.005ca_ES
dc.relation.ispartofReactive and Functional Polymers, 2005, vol. 65, núm. 3, p. 329-342ca_ES
dc.rights(c) Elsevier B.V., 2005ca_ES
dc.rights.accessRightsinfo:eu-repo/semantics/restrictedAccessca_ES
dc.subjectPoly(acrylic-co-maleic) acidsca_ES
dc.subjectPotentiometryca_ES
dc.subjectCalorimetryca_ES
dc.subjectMedium effectca_ES
dc.titleInteraction of acrylic-maleic copolymers with H+, Na+, Mg2+ and Ca2+: Thermodynamic parameters and their dependence on mediumca_ES
dc.typearticleca_ES
dc.type.versionpublishedVersionca_ES
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