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聚电解质-胶束凝聚体:聚合物内主导与聚合物间主导缔合、溶质吸收和流变性能。

Polyelectrolyte-micelle coacervates: intrapolymer-dominant vs. interpolymer-dominant association, solute uptake and rheological properties.

机构信息

Department of Polymer Engineering, University of Akron, 250 S. Forge St, Akron, OH 44325, USA.

出版信息

Soft Matter. 2019 Apr 3;15(14):3043-3054. doi: 10.1039/c8sm02229a.

DOI:10.1039/c8sm02229a
PMID:30901008
Abstract

The effects of polyelectrolyte charge density, polyelectrolyte-to-surfactant ratio, and micelle species on coacervation were studied by turbidity, dynamic light scattering, and zeta potential measurements to examine the coacervation of the weak polyelectrolyte branched polyethylenimine (BPEI) and oppositely charged sodium dodecyl sulfate (SDS) micelles as well as BPEI and mixed micelles composed of SDS and poly(ethylene glycol) 4-nonylphenyl 3-sulfopropyl ether potassium salt (PENS). The results of dynamic light scattering and zeta potential measurements are discussed in terms of pH and BPEI-to-surfactant ratio. An intrapolymer-dominant to interpolymer-dominant association model for the BPEI-micelle coacervates was proposed based on the variation of size and zeta potential of coacervate particles by their BPEI-to-surfactant ratio. The partition coefficient of solutes into BPEI-micelle coacervates was determined using UV-vis measurements as a function of pH, BPEI-to-surfactant ratio, and mixed micelle composition. Both the hydrophobicity of solutes and micelles, as well as the association mode of coacervates, impact the solute uptake efficiency. Dynamic rheological measurements on the coacervates suggest that the rheological properties of the complex coacervates are impacted by the association mode of the coacervates as well as the charge density on BPEI chains during coacervation.

摘要

通过浊度、动态光散射和动电电位测量研究了聚电解质电荷密度、聚电解质与表面活性剂的比例以及胶束种类对凝聚的影响,以考察弱聚电解质支化聚乙烯亚胺(BPEI)与带相反电荷的十二烷基硫酸钠(SDS)胶束以及 BPEI 与由 SDS 和聚乙二醇 4-壬基苯基 3-磺丙基醚钾盐(PENS)组成的混合胶束的凝聚。根据 pH 值和 BPEI 与表面活性剂的比例,讨论了动态光散射和动电电位测量的结果。基于凝聚颗粒的大小和动电电位随 BPEI 与表面活性剂比例的变化,提出了一种聚合物内主导到聚合物间主导的 BPEI-胶束凝聚模型。通过紫外-可见测量确定了溶质分配系数进入 BPEI-胶束凝聚物作为 pH 值、BPEI 与表面活性剂的比例和混合胶束组成的函数。溶质和胶束的疏水性以及凝聚物的缔合模式都影响溶质的吸收效率。对凝聚物的动态流变学测量表明,凝聚物的流变性质受到凝聚物的缔合模式以及凝聚过程中 BPEI 链上电荷密度的影响。

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