Synthesis and Surface Activities of Amidobetaine Surfactants with Ultra‐long Unsaturated Hydrophobic Chains
作者:Dan Feng、Yongmin Zhang、Quansheng Chen、Jiyu Wang、Bin Li、Yujun Feng
DOI:10.1007/s11743-012-1359-7
日期:2012.9
Recent studies have shown that the surfactants bearing an ultra‐long hydrophobic chain (>C18) exhibit unique self‐assembly properties. However, their synthesis and surface activities have been less documented. In this work, monounsaturated alkyl dimethyl amidopropyl betaines, UCnDAB (n = 18, 22, and 24), were prepared by the reaction of the corresponding fatty acids with N,N‐dimethyl‐1,3‐propanediamine
最近的研究表明,带有超长疏水链(> C18)的表面活性剂具有独特的自组装性能。但是,它们的合成和表面活性的文献较少。在这项工作中,通过相应的脂肪酸与N,N-二甲基-1,3-丙二胺的反应,然后与钠进行季铵化,制备了单不饱和烷基二甲基氨基丙基丙基甜菜碱UCnDAB(n = 18、22和24)。所得中间体的氯乙酸盐。中间体和最终表面活性剂分别通过1 H NMR和ESI-HRMS表征。还检查了Krafft温度(T K)和表面活性剂的表面活性。发现T K所有这些表面活性剂均低于0°C,并且其临界胶束浓度(CMC)在10 -3 mmol / L的范围内。此外,lg CMC和n之间的线性关系仍然很明显。