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- Title
Sizes and conformations of hydrophilic and hydrophobic polyelectrolytes in solutions of various ionic strengths.
- Authors
Pavlov, G.; Okatova, O.; Gavrilova, I.; Ul'yanova, N.; Panarin, E.
- Abstract
The hydrodynamic characteristics of macromolecules of a random copolymer of N-methyl- N-vinylacetamide and N-methyl- N-vinylamine hydrochloride containing 43.6% charged units in the molecular-mass range of 27 × 10 to 355 × 10 are studied. For solutions in 0.2 M NaCl, sedimentation and translational-diffusion coefficients are determined. For salt-free solutions and for solutions in 0.2 and 5.0 M NaCl, the intrinsic viscosities of the fractions are found. The lengths of the statistical segments of the chains are estimated in terms of the Gray-Bloomfield-Hearst theory. The behavior of the polycation, whose uncharged counterpart is a hydrophilic polymer, is compared to the behavior of poly(sodium 4-styrenesulfonate), whose uncharged counterpart is a hydrophobic polymer. The comparison is based on normalized scaling relations. It is shown that the level of compaction of macromolecules of strong polyelectrolytes at a high ionic strength is determined by the degree of hydrophobicity of their polymer chains. Polyelectrolytes based on hydrophilic polymers cannot be compacted into a preglobular state; their chains preserve a swollen coil conformation up to maximally high values of ionic strength.
- Subjects
HYDROPHILIC compounds; HYDROPHOBIC compounds; POLYELECTROLYTES; IONIC strength; MACROMOLECULES; RANDOM copolymers
- Publication
Polymer Science -- Series A, 2013, Vol 55, Issue 12, p699
- ISSN
0965-545X
- Publication type
Article
- DOI
10.1134/S0965545X13120079