间苯二甲酰胺Gemini表面活性剂的合成及性能

采用3-二甲氨基丙胺和间苯二甲酰氯为原料,合成二(3-二甲氨基丙基)间苯二甲酰胺,再分别与溴代正十二烷、溴代正十四烷和溴代正十六烷反应制得3种含酰胺键的Gemini阳离子表面活性剂(C12-N-C12、C14-N-C14、C16-N-C16).采用IR、1 H-NMR、元素分析表征了其结构.测定其临界胶束浓度(CMC)分别为5.96×10-4、1.03×10-4、6.25×10-5 mol·L-1;表面张力(γCMC)分别为40.83、38.76、38.08 mN·m-1;Krafft点分别为0、0、12℃,并研究了其乳化性、泡沫性质.

Synthesis and properties of Gemini surfactant with isophthalamide

Bis 3‐( dimethylamino ) propyl ] isophthalamide was synthesized by using isophthaloyl dichloride and 3‐dimethylaminopropylamine . T hen , three series of amide cationic Gemini surfactants , namely C12‐N‐C12 , C14‐N‐C14 and C16‐N‐C16 , were synthesized by reacting bis 3‐( dimethylamino ) propyl ] with 1‐bromododecane , 1‐bromotetradecane and 1‐bro mohexadecane , respectively . The chemical structures of products were confirmed by IR ,1 H‐NMR and elemental analysis .The CMC were 5?96 × 10 -4 ,1?03 × 10 -4 ,6?25 × 10 -5 mol? L -1 ,the γCMC were 40?83 ,38?76 ,38?08 mN ?m -1 , and the Krafft point were < 0 ,< 0 ,12 ℃ ,respectively .The forming and emulsifying property of surfactant were also studied .