N,N-二甲基正十二烷基胺/无机含氧酸体系的相态结构研究

Studies on Phase Structures of N,N-Dimethyl-n-dodecyl Amine/Inorganic Oxyacid System

利用拟三元相图法研究了 N ,N -二甲基正十二烷基胺 ( DMDA)多元体系的相态结构 ,并用电导、偏光显微镜以及红外、紫外可见光谱等手段进行了表征 .发现 N,N-二甲基正十二烷基胺体系随水相含量的增加 ,铵盐发生不同形式的有序缔合 ,分别形成了 W/O型微乳液、“节 -结”型链状缔合体、层状液晶和 O/W型微乳液 ;在层状液晶中 ,SO2 - 4 主要以桥式双齿配位形式存在 ,中性胺分子有利于体系中液晶的形成 ;层状液晶于 5 0 0 nm波长处有一吸收峰 ,在 4 30 nm附近发生“光短路”现象 。

The phase structures of N,N dimethyl n dodecyl amine/inorganic acid systems have been investigated by the methods of the pseudo ternary phase diagrams, conductance, polarizing microscope, UV Vis spectra and FTIR spectra. The results can be expressed as follows: (1) With the increase of water phase content, the amine salt aggregated orderly in different forms such as W/O micro emulsion, nodus knot catenulate aggregates, layer liquid crystal and O/W micro emulsion. (2) In layer liquid crystal, SO 2- 4 mainly combined with amine salt cation by two oxygen atoms in bridge. (3) In UV Vis spectrum of layer L.C., there is an absorption about 500 nm and \!light short circuit\' appeared at about 430 nm. These phenomena may be very important for measuring the distance between the layers of the L.C..