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Dextran-based polycations: Thermodynamic interaction with water as compared with unsubstituted dextran. 2. Flory-Huggins interaction parameter

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. Bercea, M. Nichifor, J. Eckelt, B. A. Wolf

Editorial: Macromolecular Chemistry and Physics, 212, p.1932-1940, 2011.


The Flory-Huggins interaction parameter is determined as a function of volume fraction of polymer by vapor-pressure measurements at 25, 37.5 and 50 oC for five dextran samples that differ in f, the fraction of randomly distributed charged monomer units. The heats of dilution at high polymer concentrations change from exothermal to endothermal as f increases. The results can be well
modeled by an approach accounting explicitly for chain connectivity and conformational changes. A smooth transition of the solution properties upon the random introduction of charged units into dextran is observed.

Cuvinte cheie: modeling, polyelectrolytes, polysaccharides, solution properties, water-soluble polymers