Xu Qun, Wang Liyan, Xing Fenglan
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006 People's Republic of China.
J Surfactants Deterg. 2011 Jan;14(1):85-90. doi: 10.1007/s11743-010-1207-6. Epub 2010 May 26.
A series of novel dissymmetric gemini cationics surfactants was synthesized by three-step reactions. The dissymmetric gemini surfactants contain a dodecanoic acid dimethylethylamine ester as the constant cationic part on one side of the hydroxypropyl center and a similar other cationic part, but with a different acid length (from octanoic to palmitic), on the other side. The critical micelle concentration (CMC) and the effectiveness of surface tension reduction (γ(CMC)) were determined. The surface tension measurements of dissymmetric gemini surfactants showed good water solubility, and low CMC had great efficiency in lowering the surface tension and a strong adsorption at the air/water interface. The CMC was observed to increase initially with the increase of the ester bond alkyl group. They also showed good foaming properties and wetting capabilites.
通过三步反应合成了一系列新型不对称双子阳离子表面活性剂。不对称双子表面活性剂在羟丙基中心的一侧含有十二烷酸二甲基乙胺酯作为恒定的阳离子部分，在另一侧含有类似的另一个阳离子部分，但酸链长度不同（从辛酸到棕榈酸）。测定了临界胶束浓度（CMC）和表面张力降低效率（γ(CMC)）。不对称双子表面活性剂的表面张力测量结果表明其具有良好的水溶性，低CMC在降低表面张力方面效率很高，并且在空气/水界面有很强的吸附作用。观察到CMC最初随着酯键烷基的增加而增加。它们还表现出良好的发泡性能和润湿能力。
