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Block-copolymer micelles with a interpolyelectrolyte crown
Polymer Science, Series C ( IF 1.6 ) Pub Date : 2017-08-23 , DOI: 10.1134/s1811238217010076
E. A. Lysenko , R. S. Bilan , P. S. Chelushkin

The dispersion stability, structure, and properties of polymer micelles with the hydrophobic core and the interpolyelectrolyte crown in dilute water–salt solutions are studied by turbidimetry, velocity sedimentation, static and dynamic light scattering, fluorescence spectroscopy, and electron microscopy, as well as by measuring the electrophoretic mobility of the particles. The micelles are obtained by mixing diblock copolymers PS–block-poly(N-ethyl-4-vinylpyridine bromide) and PS–block-poly(acrylic acid) by a specially developed technique of water introduction in the mixture of copolymers in a nonselective organic solvent. It is found that the dispersion stability and the structural and physicochemical characteristics of micelles with the interpolyelectrolyte crown depend on the balance of electrostatic interactions of similarly and oppositely charged units in the crown. In turn, this balance is determined by the composition of the interpolyelectrolyte crown as well as by the pH and ionic strength of solution. It is shown that the micelles with the interpolyelectrolyte crown can be considered to be a special type of polyelectrolyte nanoparticles combining the properties of polyelectrolyte micelles and interpolyelectrolyte complexes. The unique ability of such micelles to electrostatically bind similarly charged polyions with a high linear charge density to the crown is demonstrated. It is first found that such a binding can be selective.



中文翻译:

带有共聚电解质冠的嵌段共聚物胶束

通过比浊法,速度沉降,静态和动态光散射,荧光光谱和电子显微镜以及通过比浊法研究了具有疏水性核和聚电解质间冠的聚合物胶束在稀水盐溶液中的分散稳定性,结构和性能。测量颗粒的电泳迁移率。胶束是通过将二嵌段共聚物PS-获得-聚(ñ -乙基-4-乙烯基吡啶溴化物)和PS-块-通过特殊开发的在非选择性有机溶剂中将水引入共聚物混合物中的技术制得的聚丙烯酸。发现具有中间电解质冠的胶束的分散稳定性以及结构和物理化学特性取决于冠中相似和带相反电荷的单元的静电相互作用的平衡。反过来,这种平衡取决于中间电解质冠的组成以及溶液的pH和离子强度。结果表明,具有聚电解质间冠的胶束可以被认为是结合了聚电解质胶束和聚电解质间复合物的特性的一种特殊类型的聚电解质纳米颗粒。证明了这种胶束将具有高线性电荷密度的相似电荷的聚离子静电结合到冠上的独特能力。首先发现这种结合可以是选择性的。

更新日期:2017-08-23
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