ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The viscosity of a number of diverse polyelectrolytes varies with the concentration of added electrolyte according to the relation \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ \eta \right] = \left[ {\eta _0 } \right]\left( {{{C_{{\rm salt}} } \mathord{\left/ {\vphantom {{C_{{\rm salt}} } {C_{{\rm salt}}^{^ \circ } }}} \right. \kern-\nulldelimiterspace} {C_{{\rm salt}}^{^ \circ } }}} \right)^{ - m} $\end{document} except in very dilute salt solutions; [η] and [η0] are the limiting viscosity numbers in solutions of electrolyte concentration Csalt and C°salt, respectively (the latter concentration being that of any reference solution), and m is a constant whose value depends on the permeability of the polyion. This relation can be accounted for by the theory of Flory. The viscosities of several polyvinyl derivatives are found to be very similar, indicating that the ionizing group has no specific influence upon coil dimensions. In contrast, polynucleotides do not conform to this pattern; in particular, sodium ribonucleate undergoes an unusually large contraction to a highly compact flexible configuration between sodium chloride concentrations of 1 and 10 mM.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204714939
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