Search results for "Chitosan Acid-base properties Solubility Activity coefficients Ion pair formation"

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Solubility and acid-base properties and activity coefficients of chitosan in different ionic media and at different ionic strengths, at T=25°C

2009

Studies on the acid-base properties and solubility of a polyammonium polyelectrolyte (chitosan) with different molecular weights (MW 310 and 50 kDa), were performed at T=25 °C, in the pH range 2.5–7. The protonation of chitosan was investigated by potentiometry ([H+]-glass electrode) in NaCl, NaNO3 and mixed NaNO3+Na2SO4 ionic media, at different ionic strengths. Protonation constants were calculated as a function of dissociation degree α by means of two different models, namely, a simple linear model and the modified Henderson–Hasselbalch equation. Experimental data were also fitted using a model independent of α (Diprotic-like model), according to which the acid-base properties can be sim…

Activity coefficientChemistryInorganic chemistryIonic bondingProtonationChitosan Acid-base properties Solubility Activity coefficients Ion pair formationCondensed Matter PhysicsSettore CHIM/12 - Chimica Dell'Ambiente E Dei Beni CulturaliAtomic and Molecular Physics and OpticsDissociation (chemistry)Electronic Optical and Magnetic MaterialsSpecific ion interaction theoryIonic strengthStability constants of complexesMaterials ChemistrySettore CHIM/01 - Chimica AnaliticaPhysical and Theoretical ChemistrySolubilitySpectroscopyJournal of Molecular Liquids
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