腰接基对对苯二甲酸-双(4-甲氧基苯酯)液晶性的 影响

合成了一系列不同腰接取代基的刚性对苯二甲酸-双(4-甲氧基苯酯)小分子液晶化合物，研究了不同腰接取代基液晶性的影响。研究发现，如果在对苯二甲酸-双(4-甲氧基苯酯)的腰部引入不同结构的取代基,将不同程度地降低其熔点和液晶清亮点，合适的取代基则有利于液晶相的生成。

Effects of laterally substituents on the nematic mesomorphism of 1,4- bis[(p-methoxyphenoxy)carbonyl]benzene

A new series of 1, 4 - bis ( p - methoxyphenoxy) carbonyl ] benzene with different lateral substitutents were designed and synthesized. Their mesomorphic behavior was examined using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that introduction a lateral substitutent on center phenylene of 1,4 - bis (p - methoxyphenoxy)carbonyl]benzene destroys the symmetry of the molecule and results in a decrease in melting point and clearing point. A proper lateral substitutent such as methyl, bromo or hydroxyl group, is favorable for the formation of a liquid crystal phase.