物理化学学报 >> 2001, Vol. 17 >> Issue (01): 74-78.doi: 10.3866/PKU.WHXB20010116

研究简报 上一篇    下一篇

Gemini阳离子表面活性剂的合成及其胶束生成

游毅;郑欧;邱羽;郑叶鸿;赵剑曦;韩国彬   

  1. 福州大学化学系,福州 350002;厦门大学化学系,厦门 361005
  • 收稿日期:2000-04-24 修回日期:2000-06-28 发布日期:2001-01-15
  • 通讯作者: 赵剑曦 E-mail:jxzhao.colloid@fzu.edu.cn

Synthesis of Alkanediyl-α,ω-bis(Dimethyl Dodecylammonium Bromide) and their

You Yi;Zheng Ou;Qiu Yu;Zheng Ye-Hong;Zhao Jian-Xi;Han Guo-Bin   

  1. Department of Chemistry, Fuzhou University, Fuzhou 350002;Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2000-04-24 Revised:2000-06-28 Published:2001-01-15
  • Contact: Zhao Jian-Xi E-mail:jxzhao.colloid@fzu.edu.cn

关键词: Gemini表面活性剂, 联接基团, 胶束形成, 聚集数

Abstract: Cationic Gemini surfactants, alkanediylα,ωbis(dimethyl dodecylammonium bromide) have been synthesized by the following method: firstly dodecyl bromide was prepared by the reaction of dodecanol with bromic acid in the presence of strong sulfuric acid. Dodecylbromide was then reacted with N,Ntetramethyl ethane diamine(or N,Ntetramethyl hexana diamine) to prepare the title compounds. Micellization of these Gemini surfactants was investigated using conductivity measurement. The results showed that the critical micelle concentration(cmc) of the Gemini surfactants has a much lower value compared with that of the corresponding “monomer”. For a series of the Geminis with the same length(s) in the spacer chain, the cmc decreased with increasing the carbon number (m) in the alkyl chain. The aggregation number(N) of the micelle also drastically decreased with m. For the same value of m, the cmc varied slightly with s, which indicated that the electrostatic interaction between the ionicgroups of the “monomer” has been naturally changed duo to a link between the two ionicgroups of the “monomer” through a spacer. However, N was strongly decreased with s,which may be a reason of steric inhibition coming from the ionicgroups due to a link of spacer. With increasing temperature, micellization of the Gemini surfactants was slightly enhanced.

Key words: Gemini surfactant, Spacer, Micelle formation, Aggregation number