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 Ca2+ cations. Depending on the concentration of polymer and Ca2+ and on the ratio of the block lengths in the copolymer, spherical micelles were observed. Micelle formation arises from the specific interaction of Ca2+ 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. 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.

中文翻译：

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由Ca2+组成的胶束与两种带负电荷的聚电解质嵌段共聚物的对比变化

用两种阴离子聚电解质嵌段制备嵌段共聚物：聚丙烯酸钠 (PA) 和聚苯乙烯磺酸钠 (PSS)，以研究它们在 Ca2+ 阳离子存在下的水溶液中的相行为。根据聚合物和 Ca2+ 的浓度以及共聚物中嵌段长度的比例，观察到球形胶束。胶束的形成仅源于 Ca2+ 与 PA 块的特定相互作用。为了揭示嵌段共聚物胶束的结构和尺寸，进行了广泛的小角散射研究。PA块的氘化使我们能够在轻重水的可变比率下使用小角度中子散射进行对比度变化实验，结合来自小角度X射线散射和动态光散射的信息。图形摘要 具有两个阴离子聚电解质嵌段聚丙烯酸钠 (PA) 和聚苯乙烯磺酸钠 (PSS) 的嵌段共聚物响应 Ca2+ 阳离子的加入而自组装。PA 块的氘化使得在 H2O/D2O 的可变比率下使用 SANS 进行对比度变化实验成为可能，这与 SAXS 结合揭示了自组装的形态。具有两个阴离子聚电解质嵌段、聚丙烯酸钠 (PA) 和聚苯乙烯磺酸钠 (PSS) 的嵌段共聚物会随着 Ca2+ 阳离子的加入而自组装。