中文摘要：

合成了两个系列以1，3，4二噻二唑为中心基团的弯曲型分子，结合偏光显微熔点仪（POM）观察和差。示量热扫描法（DSC）研究了它们的液晶性能。研究发现，这两类弯曲型分子都会出现N相。其中，对称型五环酯类噻二唑弯曲型分子的熔点都较高，清亮点均超过360℃；含烯丙基非对称噻二唑类弯曲型分子熔点和清亮点温度大幅度降低，N相的温区较宽，以庚基为端基链的弯曲型分子出现N相的温度区间超过120℃。

英文摘要：

Two series of bent-core liquid crystals with 1,3,4- thiadiazole as the center unit were synthesized, their liquid crystalline properties were studied by POM and DSC. It is found that both of these two serie thiadiazole compounds exhibite N phase. Among them, the symmetric five benzene ring thiadiazole ester compounds have rather high melting points, the clearing temperatures are more than 360 °C. The melting points and clearing temperatures of the asymmetric thiadiazole molecules with allyl terminal chains are significantly reduced, and the bent-core molecule with heptyl as terminal groups shows N phase at a very wide temperature range （〉120 °C）.