含酰胺基Gemini阳离子表面活性剂的合成

Synthesis of a Cationic Gemini Surfactant with Amide Group

Gemini型表面活性剂分子是由2条疏水链、2个亲水基和1个间隔基组成,间隔基在靠近极性基团的部位将2个疏水基连接起来[1].亲水基可以是阴离子型（如磺酸、羧酸基等）,也可以是阳离子型（如季铵盐等）.

A novel Gemini surfactant bis[N,N′-(dodecanoylamino)ethyl]triethylenediamine bromide( BDEDE) was synthesized from ethyl bromide and bis(2-dodecanoylaminoethyl) ethylene diamine(BDEE), the latter was prepared from lauric acid and N,N′-bis(2-aminoethyl) ethylenediamine. The structure of the Gemini surfactant was characterized by elemental analysis, IR, ~1H NMR and ~13C NMR. Its critical micelle concentration( 0.105 mmol/L) and γ_cmc(31.0 mN/m) were determined. The cmc value of Gemini surfactant decreased by appoximately two orders of magnitude than cmc of dodecyltrimethylammonium bromide.