6533b830fe1ef96bd12966fe
RESEARCH PRODUCT
Intrinsic Viscosities of Polyelectrolytes: Determination and Modeling of the Effects of Extra Salt
Bernhard A. WolfAndreas Eichsubject
chemistry.chemical_classificationsymbols.namesakechemistryBoltzmann constantSalt effectsymbolsSalt (chemistry)ThermodynamicsPhysical and Theoretical ChemistryAtomic and Molecular Physics and OpticsPolyelectrolyteDilutiondescription
Based on early measurements of J. J. Hermans and co-workers (D. T. F. Pals, J. J. Hermans, Recl. Trav. Chim. Pays-Bas 1952, 71, 513-520; D. T. F. Pals, J. J. Hermans, J. Polym. Sci. 1950, 5, 733-734; D. T. F. Pals, J. J. Hermans, J. Polym. Sci. 1948, 3, 897-898), the present contribution demonstrates how primary data should be evaluated in order to obtain reliable intrinsic viscosities. This procedure yields detailed information on the changes of the intrinsic viscosities and of the corresponding viscometric interaction parameters caused by an increasing salinity of water. Both quantities decline from a maximum value in the pure solvent to a minimum value, which is approached in the limit of sufficiently high salt concentrations, and can be modeled quantitatively by means of a Boltzmann sigmoid. Particular attention is paid to the significance of results obtained by means of the method of isoionic dilution, proposed by J. J. Hermans and co-workers.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-09-14 | ChemPhysChem |