dc.contributor.author |
Bretti, Clemente |
dc.contributor.author |
Crea, Francesco |
dc.contributor.author |
Rey Castro, Carlos |
dc.contributor.author |
Sammartano, Silvio |
dc.date |
2016-11-29T11:40:29Z |
dc.date |
2005 |
dc.date |
10000-01-01 |
dc.identifier |
1381-5148 |
dc.identifier |
http://hdl.handle.net/10459.1/58687 |
dc.identifier |
https://doi.org/10.1016/j.reactfunctpolym.2005.07.005 |
dc.identifier.uri |
http://hdl.handle.net/10459.1/58687 |
dc.description |
Thermodynamic 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 ML2 |
dc.description |
We thank Università of Messina (PRA) for financial support and Ministerio de Educación, Cultura y Deporte (Spain) for the FPU fellowship of C.R.C. |
dc.language |
eng |
dc.publisher |
Elsevier |
dc.relation |
Reproducció del document publicat a https://doi.org/10.1016/j.reactfunctpolym.2005.07.005 |
dc.relation |
Reactive and Functional Polymers, 2005, vol. 65, núm. 3, p. 329-342 |
dc.rights |
(c) Elsevier B.V., 2005 |
dc.rights |
info:eu-repo/semantics/restrictedAccess |
dc.subject |
Poly(acrylic-co-maleic) acids |
dc.subject |
Potentiometry |
dc.subject |
Calorimetry |
dc.subject |
Medium effect |
dc.title |
Interaction of acrylic-maleic copolymers with H+, Na+, Mg2+ and Ca2+: Thermodynamic parameters and their dependence on medium |
dc.type |
article |
dc.type |
publishedVersion |