Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.16: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

NiPAM-salt interactions in aqueous solutions — •Jakub Polák, Vladimír Palivec, Adam Kovalčík, Pavel Vrbka, Daniel Ondo, and Jan Heyda — Department of Physical Chemistry, University of Chemistry and Technology, Prague, Czech Republic

This contribution is focused on a physico-chemical characterization of N-isopropyl-acrylamide (NiPAM) in aqueous solutions of sodium and guanidinium salts. To describe the NiPAM-salt interaction, two properties were chosen. The preferential binding of salt over that of water to the NiPAM surface, which was determined by vapor pressure osmometry (VPO), and the partial molar volume of NiPAM in salt solutions determined from large set of density measurements.

Firstly acquired data for preferential binding were used to evaluate the Salting out (Setschenow) constants and compared to literature values for similar amides. Secondly the relevant Kirkwood-Buff integrals were calculated, by joining data from osmometric and densimetric measurements. Last, the thermodynamic properties of NiPAM were compared with data for thermoresponsive polymer polyNiPAM obtained from our recently derived thermodynamic model and its combination with the Kirkwood-Buff theory of solutions.