Wormlike micelles (WLMs) formed by different types of ultra-long-chain surfactants have been well studied except for nonionic ones. Here in this paper, a series of ultra-long-chain nonionic surfactants UCn-350 (n = 18, 22, 24) were synthesized by esterification, and their molecule structures were identified using ¹H-NMR, ¹³C NMR, FT-IR, and GPC. The properties of UCn-350 solution, including the cloud point, critical micelle concentration (CMC), rheological behavior, and micellar microstructure, were systematically investigated. It was found that the aqueous solution properties of UCn-350 are highly dependent on their molecule structures. With lengthening the hydrophobic tail, their CMC values as well as the critical overlap concentration (C*) values of WLMs were decreased, and the viscoelastic micellar solution of entangled linear wormlike chains could be formed in pure water by single ultra-long-chain nonionic surfactant UCn-350, without the addition of any other compounds. The longer the hydrophobic tail is, the strongest the thickening ability is. Such viscoelastic fluids may be a good alternative for the delivery of functional ingredients in food or cosmetics.

除非离子表面活性剂外，已经对由不同类型的超长链表面活性剂形成的蠕虫状胶束（WLM）进行了很好的研究。本文中， 通过酯化合成了一系列超长链非离子表面活性剂UCn-350（n = 18、22、24 ），并使用¹ H-NMR，¹³鉴定了它们的分子结构。13 C NMR，FT-IR和GPC。系统地研究了UCn-350溶液的性质，包括浊点，临界胶束浓度（CMC），流变行为和胶束微观结构。发现UCn-350的水溶液性质高度依赖于其分子结构。随着疏水尾的加长，WLM的CMC值和临界重叠浓度（C *）值均降低，缠结线性蠕虫状链的粘弹性胶束溶液可以在纯水中通过单个超长链非离子形成表面活性剂UCn-350，不添加任何其他化合物。疏水尾巴越长，增稠能力越强。对于在食品或化妆品中的功能成分的输送，这种粘弹性流体可能是很好的选择。