合成了两个系列以1,3,4-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 ℃。

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 ℃. 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 ℃).