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Freydank A, Krasia T, Tiddy GJ, et al. Near-monodisperse sodium polymethacrylates: characterization by linear salt gradient anion-exchange chromatography. J Chromatogr Sci. 2000;38(5):185-8doi: 10.1093/chromsci/38.5.185.
Freydank, A., Krasia, T., Tiddy, G. J., & Patrickios, C. S. (2000). Near-monodisperse sodium polymethacrylates: characterization by linear salt gradient anion-exchange chromatography. Journal of chromatographic science, 38(5), 185-8. https://doi.org/10.1093/chromsci/38.5.185
Freydank, et al. "Near-monodisperse sodium polymethacrylates: characterization by linear salt gradient anion-exchange chromatography." Journal of chromatographic science vol. 38,5 (2000): 185-8. doi: https://doi.org/10.1093/chromsci/38.5.185
Freydank A, Krasia T, Tiddy GJ, Patrickios CS. Near-monodisperse sodium polymethacrylates: characterization by linear salt gradient anion-exchange chromatography. J Chromatogr Sci. 2000 May;38(5):185-8. doi: 10.1093/chromsci/38.5.185. PMID: 10813514.
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J Chromatogr Sci. 2000 May;38(5):185-8. doi: 10.1093/chromsci/38.5.185.

Near-monodisperse sodium polymethacrylates: characterization by linear salt gradient anion-exchange chromatography.

Journal of chromatographic science

Freydank, Krasia, Tiddy, Patrickios

Affiliations

  1. Department of Chemical Engineering, University of Manchester Institute of Science and Technology, United Kingdom.

PMID: 10813514 DOI: 10.1093/chromsci/38.5.185

Abstract

A family of six near-monodisperse homopolymers of sodium methacrylate (Mn = 1100, 3200, 5500, 7200, 14100, and 21000) is characterized by linear salt gradient anion-exchange chromatography. Although the retention times depend on the initial and final salt concentrations of the gradient, they are almost independent of the molecular weight of poly(sodium methacrylate). This suggests that anion-exchange chromatography is incapable of resolving mixtures of a given polyelectrolyte to their components of various molecular weights, and it is therefore impossible to identify the polydispersity of such a sample using this method. The independence of the retention times from molecular weight is also predicted by a theory based on stoichiometric mass-action ion-exchange. Using this theory and our experimental retention times, the equilibrium anion-exchange constant and the corresponding Gibbs free energy of anion-exchange of the monomer repeat unit are calculated to be around 2.1 and -1.8 kJ/mol, respectively.

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