一种含羟丙基的阳离子表面活性剂的流变性能

doi:10.13218/j.cnki.csdc.2015.01.001

摘要/Abstract

摘要： 用稳态和动态剪切流变学方法测定了3-十四烷氧基-2-羟丙基三甲基溴化铵(R₁₄HTAB)水溶液的流变特性。结果表明,R₁₄HTAB溶液的自组装结构在测定的浓度范围内经历了3次结构转变,从球形胶束到棒状胶束再到黏弹性的蠕虫状胶束,最后转变为六角状溶致液晶;在R₁₄HTAB浓度超过360 mmol/kg以后为球形到棒状胶束的转变;交缠浓度约为500 mmol/kg,零剪切黏度(η₀)与R₁₄HTAB浓度(C)之间遵循指数关系,η₀∝C^5.7。用冷冻蚀刻电镜进一步证实了胶束的微观结构。稳态和动态黏度实验中Cox-Merz规律的偏离主要来自于氢键的形成。

关键词: 3-十四烷氧基-2-羟丙基三甲基溴化铵, 流变特性, 自组装, 网络结构

Abstract: Rheological performance of aqueous solution of a cationic surfactant (3-tetradecyloxy-2-hydroxypropyltrimethylammonium bromide,R₁₄HTAB) was studied with steady and dynamic shear rheological method.Results showed that structure of the self-asembly of the R₁₄HTAB undergoes three transitions in the shape within the investigated concentration range,from spherical to rodlike micelles,then to viscoelastic wormlike micelles,and finally to hexagonal lytropic liquid crystal.The transition from spherical micelles into rodlike micelles takes place as the concentration of R₁₄HTAB higher than 360 mmol/kg.The overlapped threshold micelle concentration is about 500 mmol/kg.The viscosity at zero shear (η₀) and R₁₄HTAB concentration (C) displays exponential relationship,i.e.,η₀∝C^5.7.The microstructure of the formed micelles was further ascertained by FF-transmission electronic microscopy.The deviations from Cox-Merz rule in the steady and dynamic viscosity experiment is mainly due to formation of hydrogen bond.

Key words: 3-tetradecyloxy-2-hydroxypropyltrimethylammonium bromide, rheological property, self-asembly, network structure

中图分类号:

TQ423.12

张旭东, 葛青, 李庆霞, 杨敏, 韩传红, 魏西莲. 一种含羟丙基的阳离子表面活性剂的流变性能[J]. 日用化学工业, 2015, 45(1): 1-6.

ZHANG Xu-dong, GE Qing, LI Qing-xia, YANG Min, HAN Chuan-hong, WEI Xi-lian. Rheological performance of aqueous solution of a cationic surfactant containing hydroxypropyl group[J]. China Surfactant Detergent & Cosmetics, 2015, 45(1): 1-6.

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