表面活性剂——由十二烷基硫酸钠、聚（N-乙烯基-2-吡咯烷酮）和聚乙二醇形成的聚合物聚集体。

Surfactant--polymer aggregates formed by sodium dodecyl sulfate, poly(N-vinyl-2-pyrrolidone), and poly(ethylene glycol).

作者信息

Romani Ana P, Gehlen Marcelo H, Itri Rosangela

机构信息

Instituto de Química de São Carlos, CP 780, 13566-590 São Carlos, SP, Brazil.

出版信息

Langmuir. 2005 Jan 4;21(1):127-33. doi: 10.1021/la0482296.

DOI:10.1021/la0482296

PMID:15620293

Abstract

The interaction of sodium dodecyl sulfate (SDS) in aqueous solution with poly(N-vinyl-2-pyrrolidone) (M(w) = 55,000 g/mol) in the presence of poly(ethylene glycol) (M(w) = 8000 g/mol) is investigated by electrical conductivity, zeta potential measurements, viscosity measurements, fluorescence spectroscopy, and small-angle X-ray scattering (SAXS). The results indicate that SDS-polymer interaction occurs at low surfactant concentration, and its critical aggregation concentration is fairly dependent on polymer composition. The polymer-supported micelles have average aggregation numbers dependent on surfactant concentration, are highly dissociated when compared with aqueous SDS micelles, and have zeta potentials that increase linearly with the fraction of PVP at constant SDS concentration. The analysis of the SAXS measurements indicated that the PVP/PEG/SDS system forms surface-charged aggregates of a cylindrical shape with an anisometry (length to cross-section dimension ratio) of about 3.0.

摘要

通过电导率、ζ电位测量、粘度测量、荧光光谱和小角X射线散射（SAXS）研究了水溶液中十二烷基硫酸钠（SDS）与聚（N-乙烯基-2-吡咯烷酮）（M(w)=55,000 g/mol）在聚乙二醇（M(w)=8000 g/mol）存在下的相互作用。结果表明，SDS与聚合物的相互作用在低表面活性剂浓度下发生，其临界聚集浓度相当依赖于聚合物组成。聚合物负载的胶束具有取决于表面活性剂浓度的平均聚集数，与水性SDS胶束相比高度解离，并且在恒定SDS浓度下其ζ电位随PVP分数线性增加。SAXS测量分析表明，PVP/PEG/SDS系统形成具有约3.0的各向异性（长度与横截面尺寸比）的圆柱形表面带电聚集体。