烷氧基羟丙基三甲基溴化铵/正丁醇/水体系的相行为

Phase behavior of 3-dodecyloxy-2-hydroxypropyl trimethyl ammonium bromide/n-butanol/water system

绘制了3-十二烷氧基-2-羟丙基三甲基溴化铵(R12TAB)/正丁醇/水三元体系的相图,确定了不同区域的范围。用电导法测定了微乳液区域内由W/O型微乳液经双连续结构到O/W型微乳液的变化过程。用2HNMR和差示扫描量热法(DSC)并与液晶纹理对照,研究了该体系的液晶结构特点。结果表明,固定R12TAB和正丁醇的比例,随含水量的增加,体系的液晶相结构发生如下变化,从层状液晶→层状与六角状液晶共存→层状、六角状与立方状液晶共存→层状液晶与微乳液共存。

The phase diagram of a ternary system composed of 3-dodecyloxy-2-hydroxypropyl trimethyl ammonium bromide(R12TAB),n-butanol and water was mapped out with the scope of various regions identified.The process of changing in the microemulsion region from W/O microemulsion,through bi-continuous structure,to O/W microemulsion was investigated by electric-conductivity method.Features of the ternary system was studied by 2H magnetic resonance method(2HNMR)and differential scanning calorimeter with comparison of the texture structure of the liquid crystals.The results obtained show that in case of a fixed ratio of R12TAB and n-butanol,following the increase of water content,the liquid crystal phase structure will change from single lamellar liquid crystals→co-existence of lamellar liquid crystals and hexagonal lamellar liquid crystals→co-existence of lamellar,hexagonal and cubical liquid crystals→co-existence of lamellar liquid crystals and microemulsion. 