Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic.
Langmuir. 2011 May 3;27(9):5275-81. doi: 10.1021/la200442s. Epub 2011 Mar 29.
Formation of polyelectrolyte-surfactant (PE-S) complexes of poly[3,5-bis(trimethylammoniummethyl)-4-hydroxystyrene iodide]-block-poly(ethylene oxide) (QNPHOS-PEO) and sodium dodecyl sulfate (SDS) in aqueous solution was studied by dynamic and electrophoretic light scattering, small-angle X-ray scattering (SAXS), atomic force microscopy, and fluorometry, using pyrene as a fluorescent probe. SAXS data from the QNPHOS-PEO/SDS solutions were fitted assuming contributions from free copolymer, PE-S aggregates described by a mass fractal model, and densely packed surfactant micelles inside the aggregates. It was found that, unlike other systems of a double hydrophilic block polyelectrolyte and an oppositely charged surfactant, PE-S aggregates of the QNPHOS-PEO/SDS system do not form core-shell particles and the PE-S complex precipitates before reaching the charge equivalence between dodecyl sulfate anions and QNPHOS polycationic blocks, most likely because of conformational rigidity of the QNPHOS blocks, which prevents the system from the corresponding rearrangement.
在水溶液中，通过动态光散射和电泳光散射、小角 X 射线散射（SAXS）、原子力显微镜和荧光光度法，使用芘作为荧光探针，研究了聚[3,5-双（三甲基铵甲基）-4-羟基苯乙烯碘化物]-嵌段-聚（环氧乙烷）（QNPHOS-PEO）和十二烷基硫酸钠（SDS）的聚电解质-表面活性剂（PE-S）复合物的形成。用 QNPHOS-PEO/SDS 溶液的 SAXS 数据进行拟合，假设存在游离共聚物、由质量分形模型描述的 PE-S 聚集体以及聚集体内部紧密堆积的表面活性剂胶束的贡献。结果发现，与其他双亲性嵌段聚电解质和带相反电荷的表面活性剂的系统不同，QNPHOS-PEO/SDS 系统的 PE-S 聚集体不会形成核壳颗粒，并且在达到十二烷基硫酸阴离子和 QNPHOS 聚阳离子块之间的电荷当量之前，PE-S 复合物会沉淀，这很可能是因为 QNPHOS 块的构象刚性阻止了系统的相应重排。
