化学学报 ›› 2000, Vol. 58 ›› Issue (4): 454-457. 上一篇    下一篇

研究论文

腰接基对对苯二甲酸-双(4-甲氧基苯酯)液晶性的 影响

糜七定;周其凤   

  1. 北京大学化学与分子工程学院高分子科学与工程系
  • 发布日期:2000-04-15

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

Mi Qiding;Zhou Qifeng   

  • Published:2000-04-15

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。

关键词: 苯二甲酸P, 酯, 液晶, 甲氧基, 取代基, 结构与性能关系, 熔点

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 calorimery (DSC) and polarized optical icroscopy (POM).It was found that introduction a lateral subsituten on center phenylene of 1,4-bis [(p-methoxyphenoxy)carbonyl] benzene destros the symmetry of the molecule and results in a decrease in melting point and learing point. A proper lateral substitutent such as methyl, bromo or hydroxyl group, is favorable for the formation of a liquid crystal phase.

Key words: BENZENEDICARBOXYLIC ACID P, ESTERS, LIQUID CRYSTAL, METHOXY GROUP, SUBSTITUENT GROUP, STRUCTURE AND PROPERTY CORRELATION, MELTING POINT

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