Contrast variation of micelles composed of Ca2+ and block copolymers of two negatively charged polyelectrolytes

Block copolymers were prepared with two anionic polyelectrolyte blocks: sodium polyacrylate (PA) and sodium polystyrene sulfonate (PSS), in order to investigate their phase behavior in aqueous solution in the presence of Ca 2+ cations. Depending on the concentration of polymer and Ca 2+ and on the r...

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Bibliographic Details
Published in:Colloid and polymer science 2020-07, Vol.298 (7), p.663-679
Main Authors: Carl, Nico, Prévost, Sylvain, Schweins, Ralf, Huber, Klaus
Format: Article
Language:English
Subjects:
Acrylic resins
Aqueous solutions
Block copolymers
Calcium ions
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Deuteration
Food Science
Heavy water
Invited Article
Micelles
Nanotechnology and Microengineering
Neutron scattering
Photon correlation spectroscopy
Physical Chemistry
Polyelectrolytes
Polymer Sciences
Polystyrene resins
Small angle X ray scattering
Sodium polystyrene sulfonate
Soft and Granular Matter
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Summary:Block copolymers were prepared with two anionic polyelectrolyte blocks: sodium polyacrylate (PA) and sodium polystyrene sulfonate (PSS), in order to investigate their phase behavior in aqueous solution in the presence of Ca 2+ cations. Depending on the concentration of polymer and Ca 2+ and on the ratio of the block lengths in the copolymer, spherical micelles were observed. Micelle formation arises from the specific interaction of Ca 2+ with the PA block only. An extensive small-angle scattering study was performed in order to unravel the structure and dimensions of the block copolymer micelles. Deuteration of the PA block enabled us to perform contrast variation experiments using small-angle neutron scattering at variable ratios of light and heavy water which were combined with information from small-angle X-ray scattering and dynamic light scattering. Graphical Abstract Block copolymers with two anionic polyelectrolyte blocks, sodium polyacrylate (PA) and sodium polystyrene sulfonate (PSS) self-assemble in response to an addition of Ca2+ cations. Deuteration of the PA block made possible contrast variation experiments using SANS at variable ratios of H2O/D2O, which in combination with SAXS revealed the morphology of the self-assemblies.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-019-04596-1