腰接基对对苯二甲酸-双(4-甲氧基苯酯)液晶性的影响  

Effects of Laterally Substituents on the Nematic Mesomorphism of 1,4 - Bis[ (p - methoxyphenoxy)carbonyl]benzene

作　　者：糜七定[1] 周其凤[1] 

机构地区：[1]北京大学化学与分子工程学院高分子科学与工程系,北京100871

出　　处：《化学学报》2000年第4期454-457,共4页Acta Chimica Sinica

基　　金：中国博士后科学基金;国家自然科学基金(59873001)资

摘　　要：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对其液晶性的影响.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.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.

关 键 词：对苯二甲酸 苯脂 腰接取代基 液晶性 

分 类 号：O753[理学—晶体学]