高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (7): 1334.

• 研究论文 • 上一篇    下一篇

季铵盐Gemini表面活性剂胶团水溶液的流变性质

徐晓明, 林永生, 吴章锋, 韩国彬   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门 361005
  • 收稿日期:2003-08-18 出版日期:2004-07-24 发布日期:2004-07-24
  • 通讯作者: 韩国彬(1955年出生),男,博士,教授,从事胶体与界面科学研究.E-mail:hangb@jingxian.xmu.edu.cn E-mail:hangb@jingxian.xmu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29973033)资助

Rheological Properties of Quaternary Ammonium Gemini Surfactants in Aqueous Solutions

XU Xiao-Ming, LIN Yong-Sheng, WU Zhang-Feng, HAN Guo-Bin   

  1. State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005, China
  • Received:2003-08-18 Online:2004-07-24 Published:2004-07-24

PDF (PC)

被引次数

42

摘要： 用毛细管振荡剪切流动法研究联接基团为聚亚甲基链的季铵盐型Gemini表面活性剂C12-s-C12·2Br(s=2,4,8)的流变性质,并用动态光散射技术测定胶团生长过程中的胶团形状和大小的变化规律,探索联接基团长度对胶团形状、大小以及溶液流变性质的影响.实验结果表明,胶团形状和大小与联接基团长度有关,而溶液的流变性质主要由胶团的大小和形状所决定,球形和棒状(长椭球体)胶团溶液的流变性质以纯粘度为主,而线性胶团溶液则显示粘弹性质.此外,增加电解质浓度和降低温度均使溶液的粘度增大.

关键词: Gemini表面活性剂, 流变性质, 动态光散射

Abstract: By means of oscillatory shear flow in the capillary, rheological experiments of aqueous solutions of quaternary ammonium Gemini surfactants containing methylene groups spacer(CH2) s(referred to C12-s-C12·2Br, s=2,4,8) were carried out. By using dynamic light scattering method, the mean hydrodynamic radius(R h) of C12-s-C12·2Br micelles were measured to investigate the growth of C12-s-C12·2Br micelles. The aim of the experiments is to explore the effect of spacer chain length on the size and shape of micelles and the rheological property of the solution. The results show that the rheological property is mostly determined by the size and shape of micelles which depend on the spacer chain length of C12-s-C12·2Br. The rheological property of spherical and rodlike micelles solution is purely viscous, whereas the solution of threadlike micelles is viscoelastic. The viscosity of the solutions increases with the increase of NaBr concentration or the decrease of temperature.

Key words: Gemini surfactant, Rheological property, Dynamic light scattering

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