高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (10): 2009.doi: 10.7503/cjcu20150207

• 物理化学 • 上一篇    下一篇

四硅氧烷Gemini咪唑表面活性剂的合成及表面性能

梁维平, 赵晓辉, 安东, 徐乾, 叶志文()   

  1. 南京理工大学化工学院, 南京 210094
  • 收稿日期:2015-03-18 出版日期:2015-10-10 发布日期:2015-09-18
  • 作者简介:联系人简介: 叶志文, 男, 博士, 教授, 博士生导师, 主要从事表面活性剂方面的研究. E-mail:yezw@njust.edu.cn
  • 基金资助:
    江苏省“六大人才高峰”项目(批准号: JNHB-001)资助

Synthesis and Surface Properties of Siloxane Gemini Imidazolium Surfactant

LIANG Weiping, ZHAO Xiaohui, AN Dong, XU Qian, YE Zhiwen*()   

  1. Institute of Chemical Technology, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2015-03-18 Online:2015-10-10 Published:2015-09-18
  • Contact: YE Zhiwen E-mail:yezw@njust.edu.cn

摘要:

以三甲基氯硅烷、 γ-氯丙基三氯硅烷、 1,4-二氯丁烷和咪唑等为原料合成了一种新型的四硅氧烷Gemini咪唑表面活性剂([Si4-4-Si4im]Cl2), 通过质谱(MS)和核磁共振氢谱(1H NMR)证明所得产物为目标产物. 通过Wilhelmy板法测得其在25 ℃下的临界胶束浓度(cmc)为0.54 mmol/L, 水溶液的表面张力(γcmc)降至18.6 mN/m. 通过电导率法研究了其胶束形成热力学参数(ΔGm 0Hm 0和ΔSm 0), 表明在15~35 ℃下其胶束化过程是自发进行的, 且为熵驱动过程.

关键词: 四硅氧烷Gemini咪唑表面活性剂, 临界胶束浓度, 电导率, 表面张力, 热力学参数

Abstract:

A new siloxane gemini imidazolium surfactant 3,3'-di[γ-tri(trimethylsiloxy)silyl]propylchloride-1,1'-(1,4-butanediyl)-bisimidazole([Si4-4-Si4im]Cl2) was synthesized with chlorotrimethylsilane, γ-chloropropyltrichlorosilane, 1,4-dichlorobutane and imidazole. The structure of the surfactant was characte-rized by MS and 1H NMR spectra, and the results proved that it was consistent with the target structure. The surface tension of the surfactant was measured by Wilhelmy measuring plate method at 25 ℃. It indicates that the γcmc of the surfactant in aqueous solution can be reduced to 18.6 mN/m and the value of cmc is 0.54 mmol/L. The thermodynamic parameters of micellization(ΔGm 0,ΔHm 0,ΔSm 0) of the surfactant were researched by determination of the electrical conductivity in different concentrations. The results suggest that the process of micellization is spontaneous and micellization of [Si4-4-Si4im]Cl2 is entropydriven at 15—35 ℃.

Key words: Siloxane Gemini imidazolium surfactant, Critical micelle concentration, Electrical conductivity, Surface tension, Thermodynamic parameter

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