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首页> 外文期刊>Journal of Oleo Science >Unique Solution Properties of Quaternized Oligomeric Surfactants Derived from Ethylenediamine or GO Poly (amidoamine) Dendrimers
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Unique Solution Properties of Quaternized Oligomeric Surfactants Derived from Ethylenediamine or GO Poly (amidoamine) Dendrimers

机译：乙二胺或GO聚（酰胺基胺）树枝状大分子衍生的季铵化低聚表面活性剂的独特溶液性质

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摘要

New quaternized oligomeric surfactants containing 4 or 8 alkyl chains were synthesized using ethylenediamine or poly(amidoamine) dendrimers as the central scaffold. Electrical conductivity, surface tension, and pyrene fluorescence measurements, as well as dynamic light scattering were used to characterize their properties. In addition, the dependence of these properties on the alkyl chain length, number of chains, and dendrimer generation was determined through comparison with previously reported oligomeric surfactants. The relation between surface tension and concentration for the oligomeric surfactants exhibited clear breakpoints, which reflect the critical micelle concentration (cmc). Both cmc and surface tension were lower than those of monomeric alkyltrimethylammonium bromide surfactants, indicating that the synthesized oligomeric surfactants have excellent micelle-forming ability in solution and high adsorption ability at the air/water interface, in spite of the large bulky structure containing multiple alkyl chains and headgroups within one molecule. When the alkyl chain length or the number of chains of the oligomeric surfactants was increased, a unique behavior was observed in that adsorption at the air/ water interface and solution aggregation occurred simultaneously at a concentration below cmc (as determined by the surface tension method). This suggests that aggregate formation occurs readily in solution along with the adsorption at the interface because of strong attractive interactions between multiple alkyl chains.
机译：以乙二胺或聚（酰胺基胺）树状大分子为中心骨架，合成了含有4或8个烷基链的新型季铵化低聚物表面活性剂。使用电导率，表面张力和fluorescence荧光测量以及动态光散射来表征其性能。此外，通过与先前报道的低聚表面活性剂比较，确定了这些性质对烷基链长度，链数和树枝状聚合物生成的依赖性。低聚物表面活性剂的表面张力与浓度之间的关系显示出清晰的断点，反映出临界胶束浓度（cmc）。 cmc和表面张力均低于单体烷基三甲基溴化铵表面活性剂，这表明尽管低聚物结构大且含有多个烷基，但合成的低聚物表面活性剂在溶液中具有优异的胶束形成能力，并在空气/水界面具有高吸附能力。一个分子内的链和头基。当烷基链长或低聚表面活性剂的链数增加时，观察到独特的行为，即在低于cmc的浓度下，空气/水界面的吸附和溶液的聚集同时发生（通过表面张力法测定） 。这表明由于多个烷基链之间的强吸引力相互作用，聚集体的形成容易在溶液中发生，并且在界面处也发生吸附。

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