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Issue 35, 2015
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Polyelectrolytes in dilute solution: viscometric access to coil dimensions and salt effects

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Abstract

Copolymers of acrylamide (AM) and diallyldimethylammonium chloride (DADMAC), differing in molar masses M (52.3 to 227 kDa) and degrees of charging y (0.2 to 0.6), were studied with respect to their viscometric behavior in dilute aqueous solutions containing variable amounts of NaCl. Complementary measurements were performed on a Brookhaven 90 plus particle size analyzer. M dominates the intrinsic viscosities [η]. For the viscometric interaction parameters B this is only true for large concentrations of extra salt. [η] and B as a function of solvent salinity follow Boltzmann laws. Coil dimensions, determined either via dynamic light scattering or viscometry, agree well. For low salt contents of the solvent the radii decrease with rising polymer concentration, whereas they increase for high salt concentrations; at a characteristic salinity of the solvent they become independent. Zeta potentials grow from +20 to +40 mV as y goes up.

Graphical abstract: Polyelectrolytes in dilute solution: viscometric access to coil dimensions and salt effects

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Publication details

The article was received on 23 Jan 2015, accepted on 11 Mar 2015 and first published on 18 Mar 2015


Article type: Paper
DOI: 10.1039/C5RA01376C
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2015,5, 27674-27681
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    Polyelectrolytes in dilute solution: viscometric access to coil dimensions and salt effects

    P. R. Suresha, M. V. Badiger and B. A. Wolf, RSC Adv., 2015, 5, 27674
    DOI: 10.1039/C5RA01376C

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