季铵盐Gemini表面活性剂胶团水溶液的流变性质  

Rheological Properties of Quaternary Ammonium Gemini Surfactants in Aqueous Solutions

作　　者：徐晓明[1] 林永生[1] 吴章锋[1] 韩国彬[1] 

机构地区：[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

出　　处：《高等学校化学学报》2004年第7期1334-1337,MJ05,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 9973 0 3 3 )资助

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 C1 2 -s-C1 2 · 2 Br( 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 。By means of oscillatory shear flow in the capillary, rheological experiments of aqueous solutions of quaternary ammonium Gemini surfactants containing methylene groups spacer(CH 2) s(referred to C 12-s-C 12·2Br, s=2,4,8) were carried out. By using dynamic light scattering method, the mean hydrodynamic radius(R h) of C 12-s-C 12·2Br micelles were measured to investigate the growth of C 12-s-C 12·2Br 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 C 12-s-C 12·2Br. 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.

关 键 词：季铵盐Gemini表面活性剂 流变性质 毛细管振荡剪切流动法 动态光散射 

分 类 号：O647.2[理学—物理化学]