水/TX-100/正己醇/正辛烷反相微乳液的物化性质

Physical Chemistry Property of Water/TX-100/Hexanol/Octane Reverse Microemulsion

运用微量热计（Microcalorimeter），傅立叶变换红外（FT-IR），对水／TX-100／正己醇／正辛烷反相微乳液体系的形成过程及水的微结构进行了研究．微量热结果表明该反相微乳液的形成过程为一放热过程，且为两步反应．第一步为TX-100单体中的聚氧乙烯醚键与水分子形成氢键的过程，然后是“包裹”在反相胶束中的聚氧乙烯醚键与H2O分子形成氢键的过程，这两步反应之间存在时间差，焓变在该反相微乳液的形成过程中起着主要作用．含水量不同时，体系分别形成结合水、束缚水和自由水，并用FT-IR对此加以证实，FT-IR测试结果表明结合水、束缚水和自由水羟基吸收峰分别位于3400±20cm-1、3550±20cm-1、3220±20cm-1，在反相微乳液中脂肪醚位于比芳基醚大的极性区域，因而先于芳基醚与水作用形成氢键．

Water/TX-100/Hexanol/Octane reverse microemulsion system is studied by Microcalorimeter and FT-IR methods. The formation process of reverse microemulsions is an exothermic process and is a two step reaction. The first step is that hydrogen-bonds are formed between ether oxygen bonds of TX-100 monomers and water molecules, the second step is hydrogen-bond formation between ether oxygen bonds which are buried in aggregates and water molecules. Three types of water: bind water, trapped water, free water exist in this reverse microemulsion. This result is also proven by FT-IR. The stretch vibration peaks of hydroxyl of water are treated by curve-fitting method from 3035 cm-1 to 3700cm-1. The O-H stretch vibration frequency of trapped water, bind water and free water are 3550±20cm-1, 3400±20cm-1, 3220±20cm-1 respectively. Alkyl ether is prior to phenyl ether in acting with water because their polarity is different. Enthalpy contribution is the main driving force in the spontaneous formation of this reverse microemulsion.