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Authors
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Böhme, U. ; Scheler, U.
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Title
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Effective size and charge of polyelectrolytes
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Date
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31.12.2003
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Number
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11088
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Abstract
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The electric charge determines the properties of polyelectrolytes. The effective charge which is determined from the degree of dissociation and counterion condensation effects is determined free of any model in a combination of diffusion NMR, yielding the friction coefficient and electrophoresis NMR yielding the electrophoretic mobility [1]. The is the charge that is primarily available for the interaction with other molecules or surfaces. From the friction coefficient in addition the hydrodynamic size of the molecules is determined. From its molecular weight dependence the fractal dimension of the molecules as a measure of the use of space in the fictitious growth of the molecules. It increases with the ionic strength interpreted as an effect of charge shielding charges and additional counterion condensation. Even in salt-free solutions only a small fraction of the charges on a strong polyelectrolyte like sodium poly(styrenesulfonate) is available, this is drastically lowered upon the addition of salt.<br /><br />NMR Spectroscopy of Polymers<br />The 225th ACS National Meeting, New Orleans, LA, March 23-27, 2003
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Publisher
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Polymer Preprints
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Wikidata
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Citation
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Polymer Preprints 44 (2003) 353-354
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DOI
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http://oasys2.confex.com/acs/225nm/techprogram/P624321.HTM
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