Solution Behavior of Rod-Like Polyelectrolyte-Surfactant Aggregates Polymerized from Wormlike Micelles

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• 作者：Daniel M. Kuntz ; Lynn M. Walker
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：June 14, 2007
• 年：2007
• 卷：111
• 期：23
• 页码：6417 - 6424
• 全文大小：135K
• 年卷期：v.111,no.23(June 14, 2007)
• ISSN：1520-5207

文摘

The behavior of a rod-like, water-soluble, polyelectrolyte-surfactant aggregate system (pC₁₆TVB) in aqueoussolution is characterized to determine the partitioning of surfactant in these systems and the impact on aggregatestructure. These aggregates are generated by in situ polymerization of a cationic surfactant-hydrotrope wormlikemicelle system. This system differs from most other polyelectrolyte-surfactant systems in that the monomergroups and the surfactant are present in ion pairs in the absence of added salts or counterions, so thestoichiometry (with respect to charge) is 1:1 for the system. Therefore, after polymerization the surfactantacts as the counterion for the polyelectrolyte chains as other counterions (salts) are not available. Despitebeing present in a 1:1 molar ratio, the aggregates are surprisingly stable in water (concentrations >600 mg/mL have been achieved). The conformation of the polyelectrolyte in the aggregate is analogous to the caseof a polymer chain in tight confinement in a "tube" or cylindrical pore in which the pore walls are attractive-the tube is formed by the surfactant which is free to dissociate from the aggregates. A simple model for thestructure and partitioning is presented and the ability to manipulate the aggregate structure is demonstrated.