Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10609879 | European Polymer Journal | 2011 | 8 Pages |
Abstract
Hydrodynamic behavior of progressively quaternized poly(dimethylaminoethyl methacrylate) (PDMAEM) in dilute and semi-dilute salt-free aqueous solutions as a function of molar mass and charge density, which varied from 5 up to 100 mol%, was studied. The role of long range electrostatic interactions on the viscosity and on the position and value of the reduced viscosity corresponding to the peak, ηred,p, as a function of the charge density of polycation has been evaluated. The overlap concentration of polyelectrolytes, câ, has been evaluated as the inverse of the intrinsic viscosity determined by fitting the viscometric results on Rao equation. The values of câ have been discussed as a function of polyion molar mass and charge density. The câ values calculated in the frame of Odijk model for polyelectrolytes having quaternization degree ⩾50 were lower but comparable with those determined by viscometry, for the same molar mass.
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Authors
Ecaterina Stela Dragan, Ionel Adrian Dinu,