中文摘要：

以1，2-丙二醇为不对称中心制备了一系列手性掺杂物，与4-烷基联苯氰类向列相液晶混合配制成手征向列相液晶。通过对手征向列相液晶螺距及螺距温度依赖性的研究，发现手性掺杂物分子的末端烷基链的增长对其螺旋扭曲力有一定的影响；而手性碳原子上取代基的改变，对手性分子的螺旋扭曲力和温度依赖性有强烈的影响。

英文摘要：

Chiral dopants based on optically active （s）-propane-1,2-diol were prepared. An induced chiral nematic liquid crystal （N^＊ -LC） was achieved by mixing the chiral dopant in 4-n-alkyl-4＇-cyanobiphenyl （CBS） host nematic liquid crystal. The helical pitches of the N^＊ -LC were measured and the regularities of change were analyzed. The results showed that the length of terminal alkyl contributes to the helical twisting power （β） and the thermal stability of the N^＊ phase, but the substitution of the chiral center has a strongly effect on β and the temperature dependence of the helical pitch （dp/dt）.