Four gemini cationic surfactants were synthesized by N alkylation reaction of N,N dimethyl dodecyl amine with 1,2 ethanediol dichloracetate, 1,3 propanediol dichloracetate, 1,4 butanediol dichloracetate and 1,6 hexane...Four gemini cationic surfactants were synthesized by N alkylation reaction of N,N dimethyl dodecyl amine with 1,2 ethanediol dichloracetate, 1,3 propanediol dichloracetate, 1,4 butanediol dichloracetate and 1,6 hexanediol dichloracetate, respectively. The molecular structures of the surfactants were characterized by IR and 1H NMR spectra. The cmc values of gemini cationic surfactants SAA1, SAA2, SAA3, SAA4 were 0 91, 0 34, 0 35 and 0 78 mmol/L, respectively, much lower than that of the corresponding conventional single tailed surfactant [C 12 H 25 N(CH 3) 2CH 2 COOC 2H 5] +Cl -, whose cmc is 8 9 mmol/L. Their foaming capacity was 162, 171, 160, 168 mm, respectively , higher than 157 mm for [C 12 H 25 N(CH 3) 2CH 2COOC 2H 5] +Cl -.展开更多
文摘Four gemini cationic surfactants were synthesized by N alkylation reaction of N,N dimethyl dodecyl amine with 1,2 ethanediol dichloracetate, 1,3 propanediol dichloracetate, 1,4 butanediol dichloracetate and 1,6 hexanediol dichloracetate, respectively. The molecular structures of the surfactants were characterized by IR and 1H NMR spectra. The cmc values of gemini cationic surfactants SAA1, SAA2, SAA3, SAA4 were 0 91, 0 34, 0 35 and 0 78 mmol/L, respectively, much lower than that of the corresponding conventional single tailed surfactant [C 12 H 25 N(CH 3) 2CH 2 COOC 2H 5] +Cl -, whose cmc is 8 9 mmol/L. Their foaming capacity was 162, 171, 160, 168 mm, respectively , higher than 157 mm for [C 12 H 25 N(CH 3) 2CH 2COOC 2H 5] +Cl -.
