Association of spin-labeled substrate molecules with poly(sodium 10-undecenoate) and the sodium 10-undecenoate micelle
Association of spin-labeled substrate molecules with poly(sodium 10-undecenoate) and the sodium 10-undecenoate micelle
复制标题
自旋标记底物分子与聚（10-十一碳酸钠）和 10-十一碳酸钠胶束的缔合
DOI：
10.1021/ja00413a002
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发表时间：
1981
影响因子：
15
通讯作者：
C. Larrabee
中科院分区：
文献类型：
--
作者：
E. D. Sprague;D. C. Duecker;C. Larrabee
人们直观地认为聚十一碳烯酸钠在水溶液中具有胶束的某些特性。它与底物分子结合的能力已经用自旋标记探针进行了测试。电子自旋共振（ESR）的测量结果明确表明，聚合物很容易与两亲性和疏水性基板，如10-十一烯酸钠胶束。ESR谱的分析允许在聚合物溶液中形成的相关物种与在胶束溶液中形成的那些进行比较。既有相似之处，也有不同之处。在20世纪30年代早期，Hartley开发了一个表面活性剂胶束的简单模型：在水溶液中，表面活性剂单体聚集形成球状胶体，被描绘为被亲水壳包围的液体疏水液滴。2该模型在过去的50年中在细节上有所发展，但仍然是理解水胶束物理性质的基础^^。最近，Dill和Flory提出了这个模型的一个重要的改进6在统计晶格理论的基础上，他们得出结论，球形胶束的核心在中心附近相对有序（晶体状），远离中心相对无序（液体状）。他们的计算尚未得到直接证实。本文中描述的实验利用了由相同的表面活性剂单体形成的胶束/聚合物对。已经证明，如果浓度超过临界胶束浓度（cmc），10-十一碳烯酸钠在单体的水溶液中会发生辐射诱导聚合。聚合物（-10-mer）具有一级结构~
Poly(sodium 10-undecenoate) is intuitively expected to have some of the characteristics of micelles in aqueous solution. Its ability to associate with substrate molecules has been tested with spin-labeled probes. Electron spin resonance (ESR) measurements show unambiguously that the polymer readily associates with both amphiphilic and hydrophobic substrates, as does the sodium 10-undecenoate micelle. Analysis of the ESR spectra allows a comparison of the associated species formed in polymer solution with those formed in micelle solution. Both similarities and differences are observed. During the early 1930's, Hartley developed a simple model of surfactant micelles: in aqueous solution, surfactant monomers aggregate to form spheroidal colloids pictured as liquid hydro- phobic droplets surrounded by hydrophilic shells.2 This model has evolved in its details over the past 50 years, but has remained the basis for understanding the physical properties of aqueous micelle^.^-^ Recently, Dill and Flory proposed an important refinement of this modeL6 On the basis of a statistical lattice theory,' they concluded that the core of a spherical micelle is relatively ordered (crystal-like) near the center and relatively disordered (liquid-like) away from the center. Direct confirmation of their calculations has not yet been made. The experiments described in this paper take advantage of a micelle/polymer pair formed from the same surfactant monomer. Sodium 10-undecenoate has been shown to undergo radiation- induced polymerization in aqueous solutions of the monomer, provided the concentration exceeds the critical micelle concen- tration (cmc).* The polymer (-10-mer) has t he primary structure ~~~~~