十二烷基硫酸钠/正戊醇/水体系的相行为研究

Studies on Phase Behaviors of SDS/n-C_5H_(11)OH/H_2O System

在25℃下测定了十二烷基硫酸钠（SDS）/正戊醇/水三元体系的相平衡,确定了液晶区域的边界范围,在液晶区域内选取一系列样品点,用差示扫描量热法（DSC）与液晶纹理对照,研究了该体系的液晶结构特点.结果表明,在恒定温度下,该体系存在着两个液晶区域,并且随含水量的增加,液晶结构发生不同的变化.当组成固定时,体系的液晶相结构随温度升高也发生变化.

The equilibrium phase diagrams for the sodium dodecyl sulfate(SDS)/n-C5H11OH/H2O were determined at 25℃. The polarizing microscope and the DSC scan methods have been used in determining the structures for various samples in SDS/n-C5H11OH/H2O liquid crystalline regions. The results showed:the liquid crystal phase constructions not only change with varing of the water content at a certain temperature, but also change with varing of temperature at a certain composition in two liquid crystalline regions.