Small-angle scattering by polyelectrolyte solutions. Hydration and conformation of poly(methacrylic acid)

Hydration and conformation of poly(methacrylic acid) in D 2O ( c = 0.036 g cm −3), neutralized by NaOD or LiOD, was studied by combination of neutron and X-ray small-angle scattering in the whole range of the degree of neutralization, α. Differences in the radii of gyration of polyion cross-section...

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Bibliographic Details
Published in:Polymer (Guilford) 1986-08, Vol.27 (8), p.1241-1246
Main Authors: Pleštil, J, Ostanevich, Yu.M, Bezzabotnov, V.Yu, Hlavatá, D
Format: Article
Language:English
Subjects:
conformation
hydration
poly(methacrylic acid)
polyelectrolyte solution
small-angle scattering
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Summary:Hydration and conformation of poly(methacrylic acid) in D 2O ( c = 0.036 g cm −3), neutralized by NaOD or LiOD, was studied by combination of neutron and X-ray small-angle scattering in the whole range of the degree of neutralization, α. Differences in the radii of gyration of polyion cross-section determined from the X-ray and neutron data indicate the existence of a monomolecular hydration shell, the density of which for α = 1 is about 10% higher than that of bulk water. Condensation of counterions on the polymer chain, increasing with α, has been proved. Persistence length is about 8 Å for α ⩽ 0.2, increases up to 12 Å for α ⋍ 0.2–0.5 and then remains constant.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(86)90013-3