Synthesis and Properties of Gemini Cationic Surfactants with Amide Spacers

摘要

Four gemini cationic surfactants {N,N'-di[2-(lauryldimethylamino)acetyl]polymethylenediarnine dichlo-ride,LAA-s-LAA.5 = 2,3,4,6} were synthesized by using four bis(a-chloroacetamide)s and N,N-dimethyl-laurylamine,respectively.The molecular structures were characterized by means of IR,~1H NMR.~(13)C NMR and MS,and the behavior of their aqueous solutions was studied.The critical micell concentrations (CMC) of LAA-s-LAA were one order of magnitude lower than that of dodecyltrimethyl ammonium chloride(DTAC).With the change of the length of spacer chain(s),their CMC values change,and CMC reaches the top value at s=4.