连接基对双子表面活性剂2C_(12)H_(25)C_nAm表/界面性质的影响  

DEPENDENCE OF INTERFACIAL PROPERTIES OF AQUEOUS SOLUTION OF A TYPE OF CARBOXYLATE GEMINI SURFACTANT ON ITS LENGTH OF SPACER GROUP

作　　者：罗利娟[1] 胡星琪[1,2] 张积鑫 杨彦东[1] 陈明贵[1] 

机构地区：[1]西南石油大学研究生院,四川成都610500 [2]油气藏地质及开发工程国家重点实验室,四川成都610500 [3]青海盐湖镁业有限公司金属镁一体化项目,青海格尔木816000

出　　处：《精细石油化工》2012年第1期5-8,共4页Speciality Petrochemicals

摘　　要：通过三步反应合成出一系列不同碳原子数连接基阴离子双子表面活性剂(N,N′-双十二烷基-双羧丙酰基-烷撑二胺(2C12H25CnAm,n=2,3,4)。三种表面活性剂都具有低临界胶束浓度,且都能高效地降低表面张力。通过pC20,CMC/C20,pC30,CMC/C30参数分析了它们的吸附和胶束化行为。表面活性剂CMC值随连接基长度的增加先减小再增大,在n=3时达到最小2.17×10-5 mol/L;界面张力值随着连接基长度的增加而减小,最小可达到1.87mN/m。A series of carboxylate Gemini surfactants were synthesized through three-step reactions and named alkylidene-bis-（N-dodecyl-carboxypropylamide） （2C12 H25Cn Am; n is the number of methylene of 2, 3 or 4 in the linked group）. As all Gemini surfactants, the surface tension measurements of 2C12 H25 C.Am show low critical micelle concentrations （CMC）, and great efficiency in lowering the surface tension. In addition, adsorption and micellization behavior of 2C12 H25C.Am was estimated by parameters of p C20, CMC/C20, Pc30 and CMC/C30. Furthermore, from the dynamic surface tension measurements, it is found that the CMC values first decreased with increasing the spacer length and reached the minimum of 2.17× 10^-5 mol/L at n= 3, then increased with increasing the spacer chain length and the interracial tension values decreased with the minimum value of 1.87 mN/m.

关 键 词：羧酸双子表面活性剂 水溶液 表/界面性质 连接基长度 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]