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RESEARCH PRODUCT
Polyacrylate Protonation in Various Aqueous Ionic Media at Different Temperatures and Ionic Strengths
And Daniela PiazzeseConcetta De StefanoSilvio SammartanoAntonio Gianguzzasubject
Aqueous solutionChemistryIonic strengthGeneral Chemical EngineeringEnthalpyInorganic chemistryIonic bondingProtonationGeneral ChemistryAlkali metalPolyelectrolyteIondescription
The protonation constants of the polyacrylate anion (molecular mass 2000 Da) in Et4NI, Me4NCl, LiCl, LiNO3, NaCl, NaNO3, and KCl aqueous solution, were determined in a wide range of ionic strengths. A three-parameter approximation was used to express protonation constants as a function of the dissociation degree α, and their dependence on ionic strength was considered using a simple polynomial expansion. Differences in log KH between different data in different media were interpreted in terms of weak complex formation between polyacrylate and alkali metal cations. Measurements were also performed at different temperatures (15 ≤ T/°C ≤ 55) in order to calculate enthalpy and entropy changes for the protonation of the polyacrylate. Thermodynamic parameters for the protonation of monomer, acrylic acid, were studied potentiometrically at different temperatures and ionic strengths for purposes of comparison.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-08-15 | Journal of Chemical & Engineering Data |