Synthesis and interfacial properties of ethoxylated cationic surfactants derived from n-dodecyl glycidyl ether

Abstract

In this study, cationic surfactants were synthesized to improve solubility in water by adding ethylene oxide as a hydrophilic group to the intermediates of di-hydroxyl cationic surfactant molecules. The structure of resulting product was elucidated by H-1 NMR, FT-IR and HR/MS. The CMCs of BA-2-MA and BA-5-MA surfactants were found to be 9.01 x 10(-4) and 4.92 x 10(-3) mol/L respectively and the surface tensions at their CMC conditions were 28.64 and 32.22 mN/m respectively. The interfacial tensions measured between 1 wt% surfactant solution and n-decane were found to be in the same order of magnitude as those exhibited between micellar solutions and nonpolar oils. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.