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Issue 15, 2018
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Spectrum of hydrodynamic volumes and sizes of macromolecules of linear polyelectrolytes versus their charge density in salt-free aqueous solutions

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Abstract

Molecular characteristics of statistical copolymers based on hydrophilic poly(N-methyl-N-vinylacetamide) have been monitored throughout the entire possible range of charge density from 1.5 to 39 mol%. Different trends in the dependence of intrinsic viscosity on the average charge density of polymer chains at minimal ionic strength were revealed. A new parameter, lqq/Abare, describing this behavior was proposed (lqq is the average distance between the neighboring charges along the chain, and Abare is the statistical segment length of a non-charged homologue). For polyelectrolyte chains, this parameter allows the regions of charge density values where electrostatic long-range or short-range interactions dominate to be indicated. Two homologous series of copolymers were characterized by methods of molecular hydrodynamics under conditions of suppressed charge effects. Intrinsic viscosity in salt-free solutions characterizing an individual macromolecule was estimated by a method proposed earlier [Pavlov et al., Russ. J. Appl. Chem., 2006, 79, 1407–1412].

Graphical abstract: Spectrum of hydrodynamic volumes and sizes of macromolecules of linear polyelectrolytes versus their charge density in salt-free aqueous solutions

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Publication details

The article was received on 28 Feb 2018, accepted on 17 Mar 2018 and first published on 20 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP01329B
Citation: Phys. Chem. Chem. Phys., 2018,20, 9975-9983
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    Spectrum of hydrodynamic volumes and sizes of macromolecules of linear polyelectrolytes versus their charge density in salt-free aqueous solutions

    G. M. Pavlov, O. A. Dommes, O. V. Okatova, I. I. Gavrilova and E. F. Panarin, Phys. Chem. Chem. Phys., 2018, 20, 9975
    DOI: 10.1039/C8CP01329B

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