News & Press: Technical News

Synthesis and Properties of a Series of CO2 Switchable Gemini Imidazolium Surfactants

Tuesday, January 13, 2015  
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H Lu, Y He, Z Huang - Tenside Surfactants Detergents, 2014

... 1 (2013). DOI 10.1007/s11743-013-1472-2. 22. Wang, S., Furuno, T. and Cheng, Z.: Synthesis of 1-hydroxyethyl-2-alkyl-2-imi- dazoline and its derivative sulfonate amphoteric surfactant from tall oil fatty acid, J. Wood Sci. 49 (2003) 371, DOI 10.1007/s10086-002-0476-8. 23. ...



Novel switchable gemini imidazolium surfactants with different carbon atoms in hydrophobic group were successfully synthesized by condensation of fatty acid with triethylene tetramine, then the intermediates were reacted with CO2 to give the imidazolinium bicarbonates. The structures of intermediates and products were identified by IR and 1H-NMR spectra. As the results show, the structures of the products obtained correspond to the target compounds designed. By surface tension measurements, these Gemini surfactants have excellent surface activity with low cmc and surface tension. The conductivity and surface tension cycles show that these surfactants could be switched from imidazoline (neutral form) to imidazolium bicarbonate (charged form) reversibly and repeatedly.