• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Characterizations of polymer/surfactant and aliphatic alcohol/surfactant micellar electrokinetic chromatography systems.
【24h】

Characterizations of polymer/surfactant and aliphatic alcohol/surfactant micellar electrokinetic chromatography systems.

机译：聚合物/表面活性剂和脂族醇/表面活性剂胶束电动色谱系统的表征。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Characterizations are performed on polymeric, surfactant, mixed polymeric/surfactant, and modified surfactant pseudo-stationary phases used in Micellar Electrokinetic Chromatography (MEKC) systems.; The polymer Elvacite 2669 is a triblock co-polymer, poly (methyl methacrylate/ethyl acrylate/methacrylic acid), that can be used as a MEKC pseudo-stationary phase. This polymer was mixed with an anionic surfactant, sodium dodecyl sulphate (SDS) and characterized using various analytical techniques. The interactions between these two phases were investigated using surface tension, conductance, and spectroscopic measurements. The mixed pseudo-stationary phase was also characterized using Linear Solvation Energy Relationships (LSER).; The anionic surfactant, SDS, is a popular pseudo-stationary phase used in MEKC. Characterizations of this pseudo-stationary phase after modification with aliphatic alcohols were performed using LSER. A homologous series of eight linear alcohols were grouped into short, intermediate, and long chain lengths. The changes in properties of the modified phases within each group were examined as the alcohol chain length was increased. The largest changes occurred with the dipolarity, polarizability and hydrogen bonding properties. The dipolarity and hydrogen bond donating ability of the phase decreased as the chain length increased. The polarizability and hydrogen bond accepting ability increased as the chain length increased. The largest changes in these properties occurred with the intermediate chain length alcohols. Co-micellization or the incorporation of alcohols in the SDS micelle can explain the changes in these LSER properties. As alcohols are added to SDS, water in the palisade and stem layers of the micelle is modified so that the micelle is less hydrated. Thus changing the micelle dipolarity and hydrogen bonding properties. Hexanol caused the largest changes in micellar properties and thus in solute selectivity. Addition of short chain length alcohols, methanol and ethanol, cause only small changes in the micelle, even though they were added at large concentrations. They mostly modify the bulk aqueous phase. The addition of long chain alcohols show small changes in LSER properties but this is because of their limited solubility in these micellar phases.
机译：表征是在胶束电动色谱（MEKC）系统中使用的聚合物，表面活性剂，混合的聚合物/表面活性剂和改性的表面活性剂伪平稳相上进行的。聚合物Elvacite 2669是三嵌段共聚物，聚（甲基丙烯酸甲酯/丙烯酸乙酯/甲基丙烯酸），可用作MEKC准平稳相。将该聚合物与阴离子表面活性剂十二烷基硫酸钠（SDS）混合，并使用各种分析技术进行表征。使用表面张力，电导和光谱测量研究了这两个相之间的相互作用。还使用线性溶剂能关系（LSER）表征了混合的伪平稳相。阴离子表面活性剂SDS是MEKC中常用的伪平稳相。使用LSER进行脂族醇改性后，该假平稳相的表征。八个直链醇的同源系列分为短链，中链和长链。随着醇链长度的增加，检查各组内改性相的性质变化。变化最大的是偶极性，极化性和氢键性质。该相的双极性和氢键给体能力随着链长的增加而降低。极化率和氢键接受能力随着链长的增加而增加。这些性质的最大变化发生在中链长度的醇中。 SDS胶束中的共胶束化或醇的掺入可以解释这些LSER特性的变化。当将醇添加到SDS中时，胶束的木栅和茎干中的水会被改性，从而使胶束的水合程度降低。因此改变了胶束的偶极性和氢键性质。己醇在胶束特性和溶质选择性方面引起了最大的变化。短链长度的醇，甲醇和乙醇的加入，即使胶束浓度很高，也只会引起胶束的微小变化。它们主要改性本体水相。长链醇的添加显示出LSER性质的微小变化，但这是由于它们在这些胶束相中的溶解度有限。

著录项

  • 作者

    Leonard, Michael Shawn.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Chemistry Analytical.; Chemistry Organic.; Chemistry Polymer.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 161 p.
  • 总页数 161
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;有机化学;高分子化学（高聚物）;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号