系列3-烷氧基-2-羟基丙基三甲基氯化铵的表面活性研究  

Study on Micellization of 3-Alkyloxy-2-hydroxypropyl Trimethylammonium Chloride in Aqueous Solution by Drop Volume Method

作　　者：张骞[1] 魏西莲[1] 刘杰[1] 李子星[1] 范新建[1] 

机构地区：[1]聊城大学山东省化学储能与新型电池技术重点实验室,山东聊城252059

出　　处：《聊城大学学报（自然科学版）》2014年第3期75-79,共5页Journal of Liaocheng University:Natural Science Edition

基　　金：山东省自然科学基金资助(ZR2012BQ013);聊城大学大学生科技文化创新基金(SF2013084;SF2013116)

摘　　要：本文使用滴体积法测定了三种不同烷基链长度的3-烷氧基-2-羟基丙基三甲基氯化铵(RnHTACl,n=12,14,16)在293.15K到323.15K温度范围内的临界胶束浓度(cmc)值.利用相分离模型计算出不同温度下胶束形成过程中的热力学函数,同时利用Gibbs吸附模型计算出表面活性剂在表面上的饱和吸附量(Гmax)和单分子饱和吸附面积(Amin).测定结果表明,R12HTACl的cmc值随着温度的升高呈U型变化;而R14HTACl和R16HTACl的cmc随着温度的升高单调增加.与文献值比较发现,使用滴体积法测定的cmc值较电导率和量热法大但在误差允许范围以内,该差别可能是由于不同测定方法引起的.The critical micelle concentration values of 3-alkyloxy-2-hydroxypropyl trimethylammonium chloride（RnHTACl,n =12,14,16）in aqueous solutions had been determined by drop volume method in the temperature range of 293.15 Kto 323.15 K.Then the thermodynamic parameters of micellization were calculated by applying a mass-action model equation.For the adsorption of RnHTACl at the air/water interface,the maximum surface excess concentration（Гmax）and the minimum area（Amin）occupied per surfactant molecule at the air/water interface can be calculated according to the Gibbs adsorption isotherm equation.The results show that the cmc variation of R12 HTACl with temperature shows the typical U-shape curve,while the cmc of R14 HTACl and R16 HTACl increase with the rise of the temperature due to the limited temperature investigated.Comparing the cmc values reported there exists in large difference caused by the different methods,while the errors are in the range allowed by the specification.

关 键 词：3-烷氧基-2-羟基丙基三甲基氯化铵 滴体积法 临界胶束浓度 

分 类 号：TQ423.2[化学工程]