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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Soluble Aggregates in Aqueous Solutions of Polyion-Surfactant Ion Complex Salts and a Nonionic Surfactant
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Soluble Aggregates in Aqueous Solutions of Polyion-Surfactant Ion Complex Salts and a Nonionic Surfactant

机译：聚离子表面活性剂离子复合盐和非离子表面活性剂水溶液中的可溶性聚集体

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摘要

Water-soluble aggregates based on two polyion—surfactant ion "complex salts", consisting of hexadecyltrimethylammonium (C_(16)TA~+) and polyacrylate (PA~-) with either 25 or 6000 repeating units, with added nonionic surfactant octaethylene glycol monododecyl ether (C_(12)E8) have been investigated. A previous phase study has shown that added C_(12)E5 or C_(12)E8 can solubilize complex salts in aqueous systems, and that increasing the poly(ethylene oxide) chain length of the nonionic surfactant and/or decreasing the polyion length favors dissolution. In this work we report on dynamic light scattering, NMR diflusometry, small-angle X-ray scattering, and isothermal titration calorimetry measurements performed to characterize the solubilized composite aggregates in dilute aqueous solution in terms of size and stoichiometry. It was found that mixed aggregates of polyacrylate, C_(16)TA~+ ions, and C_(12)E8, with almost constant stoichiometry, coexist with free micelles of C_(12)E8 at all investigated mixing ratios. The length of the polyion only weakly affects the stoichiometry of the mixed aggregates while strongly affecting their size and water solubility.
机译：基于两种聚离子-表面活性剂离子“复合盐”的水溶性聚集体，由十六烷基三甲基铵（C_（16）TA〜+）和聚丙烯酸酯（PA〜-）组成，具有25或6000个重复单元，并添加了非离子表面活性剂八甘醇单十二烷基醚（C_（12）E8）已被研究。先前的阶段研究表明，添加C_（12）E5或C_（12）E8可以溶解水性系统中的复杂盐，并且增加非离子表面活性剂的聚环氧乙烷链长和/或减小聚离子长度是有利的解散。在这项工作中，我们报告了动态光散射，NMR散射测定法，小角度X射线散射和等温滴定量热法测量，以表征稀水溶液中溶解的复合聚集体的大小和化学计量。发现在所有研究的混合比下，具有几乎恒定的化学计量的聚丙烯酸酯，C_（16）TA〜+离子和C_（12）E8的混合聚集体与C_（12）E8的游离胶束共存。聚离子的长度仅微弱地影响混合的聚集体的化学计量，而强烈地影响其尺寸和水溶性。

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